Dr.Y.C.Ratnakaram served the University in different capacities
1.Assistant Warden, S.V.U.P.G. Hostels, Kavali during the period 1999-2000.
2.Vice-President, Students Council of Societies, S.V.U.P.G. Centre, Kavali during the period
2000-2001.
3.First Co-ordinator, Department of Mathematics, S.V.U.P.G. Centre, Kavali during the period 2002-2004.
4.Editor, S.V.U.P.G. Centre Magazine during the period 2003-2004.
5.Co-Ordinator, Dept. of MCA, S.V.U.P.G. Centre, Kavali during 2006-2007.
6.Deputy Warden for Women’s hostel during 2006-2007.
7.Head, Department of Physics, S.V.U.P.G. Centre, Kavali during 2005-2007.
8.Special Officer, S.V.U.P.G. Centre, Kavali during 2007-2008.
9.Co-ordinator, 5 year integrated course in M.Sc Physics, S.V. University, Tirupati during 2010-2012.
10.Co-ordinator, M.Sc Physics, DDE, S.V. University, Tirupati during 2010-2012.
11.Head, Department of Physics, S.V.University, Tirupati during 2012-14.
12.Chairman, BOS, Department of Physics, S.V.University, Tirupati during 2015-2018.
General Publications
1. Y.C. Ratnakaram and S. Buddhudu
“Evaluation of Judd-Ofelt intensity parameters for Sm3+ and Dy3+ in a laser liquid”, Materials Chemistry and Physics, 12: 443-448, 1985.
2. Y.C. Ratnakaram and S. Buddhudu
“Absorption intensities for Ho3+, Eu3+ and Tb3+ ions in a laser liquid”. Materials letters, 3: 389-392, 1985.
3. Y.C. Ratnakaram and S. Buddhudu
“Oscillator strengths and lifetimes of the excited levels of Tm3+ ion SeOCl2 +SnCl4 laser liquid”. Ind. J. Physics., 60B:242-247, 1986.
4. Y.C. Ratnakaram, S.V.J. Lakshman and S. Buddhudu
“Oscillator strengths and lifetimes for the excited states of Pr3+ and Tm3+ ions in HClO4 + DClO4 acid” Ind. J. Pure and Appl. Phys., 24 : 202-203, 1986.
5. Y.C. Ratnakaram, S. Buddhudu and Ch. Gopinath
“Electronic Absorption spectra of Pr3+ complexes in solution”., Current Science., 55 : 825- 827, 1986.
6. S.V.J. Lakshman and Y.C. Ratnakaram
“Spectral studies of preseodymium (III) and thulium (III) in certain sulphate glasses”. J. of less-common metals., 126-227-232, 1986.
7. S.V.J. Lakshman and Y.C. Ratnakaram
“Optical studies of Erbium(III) in certain sulphate glasses”., J. Non-Cryst. Solids., 94:222-228, 1987.
8. S.V.J. Lakshman and Y.C. Ratnakaram
“Spectroscopic investigations on Tm3+ in certain suphate glasses”., Lanthanide and Actinide Research, Vol. 2, No.2, 117-126, 1987.
9. J. Lakshmana Rao, B. Sreedhar, Y.C. Ratnakaram and S.V.J. Lakshman
“Electron spin resonance and optical absorption spectra of Mn2+ ions in Na2SO4+ZnSO4 glasses”., J. Non-Cryst. Solids., 92 : 175-179, 1987.
10. S.V.J. Lakshman and Y.C. Ratnakaram
“Optical absorption spectra and radiative intensities of Pr3+ in sulphate glasses”., J. Non-Cryst. Solids., 101: 75-79, 1988.
11. S.V.J. Lakshman and Y.C. Ratnakaram
“Studies on the electronic spectra of triply ionized neodymium ion in certain sulphate glasses”., Phys. and Chem. of Glasses, Vol.29, No.1, 26-29, 1988.
12. S.V.J. Lakshman and Y.C. Ratnakaram
“Spectral characteristics of lanthanide ions in glasses”., Phys. and Chem. of Glasses. Vol.31, No.1, 42-44, 1990.
13. Y.C. Ratnakaram
“Hypersensitivity in the 4f-4f absorption spectra of lanthanide (III) sulphate glasses”., Phys. and Chem. of glasses., Vol.35, No.4, 2-5, 1993.
14. Y.C. Ratnakaram
“Electronic absorption spectra of Pr3+ ion in borate glass”. Ind. J. of Pure and Appl. Physics., Vol.32, 284-286, 1994
15. Y.C. Ratnakaram and S. Buddhudu
“Optical absorption spectra and laser analysis of Nd(III) in fluoroborate glasses”. Solid State Communications, Vol.97, No.8, 651-655, 1996.
16. Y.C. Ratnakaram and S. Buddhudu
“Spectroscopic investigations of Nd3+ ion in Lead acetate glass”. Bulletin of Materials Science, Vol.19, No.3, 581-586, 1996.
17. Y.C. Ratnakaram, N. Sudharani and S. Buddhudu
“Spectroscopic investigations on Er3+ and Tm3+ ions in Lead acetate glass”. Phys. Chem. Glasses, 38(4), 184-187, 1997.
18. Y.C. Ratnakaram and N. Sudharani
“Spectroscopic investigations of Er3+ in H3BO3-Na2CO3-RCl glasses”. J. Non-Cryst. Solids, 217, 291-298, 1997.
19. Y.C. Ratnakaram and N. Sudharani
“Optical absorption spectra and Judd-Ofelt analysis of Nd3+ in certain chloroborate glasses”. J. Phys. Chem. Solids, Vol.59, No.2, 215-219, 1998.
20. Y.C. Ratnakaram
“Optical absorption spectra and energy gap studies of Pr3+ doped chloroborate glasses”. Ind. J. Phys., 73A(4), 603-609, 1999.
21. Y.C. Ratnakaram and A. Viswanadha Reddy
“Optical absorption spectra and energy gap studies in praseodymium chlorophosphate glasses” Phys. Chem. Glasses, 41 (3), 121, 2000.
22. Y.C. Ratnakaram and A. Viswanadha Reddy
“Electronic spectra and optical band gap studies in neodymium chlorophosphate glasses”. J. Non-Cryst. Solids, 277, 142-154, 2000.
23. Y.C. Ratnakaram and A. Viswanadha Reddy
“Correlation of radiative properties of rare earth ions (Pr3+ and Nd3+) in chlorophosphate glasses – 0.1 and 0.5 mol% concentrations”. Bull. of Mat. Science, Vol. 24, No. 5, 539-545, 2001.
24. Y.C. Ratnakaram and A. Viswanadha Reddy
“Electronic absorption spectra and optical band gap studies of Er3+ ions in different
chlorophosphate glasses” Spectrochemica Acta Part A 58, 1809-1822, 2002.
25. Y.C. Ratnakaram and A. Viswanadha Reddy
“Radiative and non-radiative transitions of Tm3+ doped different chlorophosphate glasses”, communicated to Optical Materials, 2001.
26. Y.C. Ratnakaram, R.P.S. Chakradhar, K.P. Ramesh, J.L. Rao and J. Ramakrishna
“The effect of host glass on optical absorption and fluorescence of Nd3+ in x(Na2O).(30-x)
(K2O).70(B2O3) Glasses”, J. Phys: Condens. Mater, 15, 6715-6730, 2003.
27. Y.C. Ratnakaram, R.P.S. Chakradhar, K.P. Ramesh, J.L. Rao and J. Ramakrishna
“Mixed alkali effect in borate glasses – Optical absorption studies in Ho3+ in x(Na2O) (30-x)
(K2O). 70(B2O3) Glasses”, Journal of Materials Science, 38(4), 833-841, 2003.
28. Y.C. Ratnakaram, Md. Abdul Altaf, R.P.S. Chakradhar, J.L. Rao and J. Ramakrishna
“Influence of Nd3+ concentration on its optical absorption and fluorescence properties in
potassium borate glass”, Physica Status Solidi (b)”, Vol.236, No.1, 200-208, 2003.
29. Y.C. Ratnakaram, M. Abdul Altaf and K. Ravindra Prasad
“Effect of concentration on its optical absorption properties of Pr3+ doped potassium borate
glass”, Indian J. Phys. 78A(3), 315-319, 2004.
30. Y.C. Ratnakaram, A. Vijaya Kumar, D. Tirupati Naidu, R.P.S. Chakradhar and J.L. Rao
“Electronic spectra of Pr3+ doped mixed alkali borate glasses”, Phys. and Chem. Glasses.
44(5), 376-381, 2003.
31. Y.C. Ratnakaram, D. Tirupati Naidu, A. Vijaya Kumar, R.P.S. Chakradhar and J.L. Rao
“Characterization of Tm3+ doped mixed alkali borate glasses – Spectroscopic investigations” Phys. Chem. Solids, 64, 2487-2495, 2003.
32. Y.C. Ratnakaram, D. Tirupati Naidu, A. Vijaya Kumar, R.P.S. Chakradhar and J.L. Rao
“Optical spectroscopy of Ho3+ ions in mixed alkali borate glasses”, J. Phys. : Conds. Matt. ,
16, 3779-3790, 2004.
33. Y.C. Ratnakaram, A. Vijaya Kumar, D. Tirupati Naidu, R.P.S. Chakradhar, K.P.Ramesh
and J.L. Rao
“Effect of mixed alkalies on the optical absorption and luminescence spectra of Nd3+ in
borate glasses-Spectroscopic investigations”, J. Lumn., Vol. 110/1-2, 63-75, 2004.
34. Y.C. Ratnakaram, D. Tirupati Naidu, A. Vijaya Kumar and N.O. Gopal
“Studies on optical absorption and luminescence properties of Dy3+ doped mixed alkali
borate glasses”, Opt. Materials, Vol. 27/3, 409-417, 2004.
35. Y.C. Ratnakaram, A. Vijaya Kumar, D. Tirupati Naidu and J.L. Rao
“Compositional dependencies of optical absorption and emission properties of Pr3+ in mixed alkali borate glasses”, Mat. Letters, Vol. 58/30, 3908-3914, 2004.
36. Y.C. Ratnakaram, A. Vijaya Kumar, D. Tirupati Naidu and J.L. Rao
“Optical absorption and photoluminescence properties of Er3+ doped mixed alkali borate glasses”, Spectrochemica Acta Part A, Vol. 61/9, p2169-2179, 2005.
37. Y.C. Ratnakaram, D. Tirupati Naidu, A. Vijaya Kumar and N.O. Gopal
“Influence of mixed alkalies on absorption and emission properties properties of Sm3+ ions in borate glasses” , Physica B, Vol. 358/1-4, p296-307, 2005.
38. Y.C. Ratnakaram, D. Tirupati Naidu, A. Vijaya Kumar and R.P.S. Chakradhar
“Absorption and emission properties of Nd3+ in lithium cesium mixed alkali borate glasses”, Solid State Comm. 136/1, p49-55, 2005.
39. Y.C. Ratnakaram, J. Lakshmi and R.P.S. Chakradhar
“Optical absorption and fluorescence properties of Er3+ in sodium borate glass”, Bull. Mat.
Science, Vol. 28, No.5, August 2005.
40. Y.C. Ratnakaram, A. Vijaya Kumar, and R.P.S. Chakradhar
“Optical absorption and emission properties of Pr3+ and Er3+ in lithium cesium mixed alkali borate glasses”, J. Luminescence, 118, p227-237, 2006.
41. Y.C. Ratnakaram, D. Tirupathi Naidu and R.P.S. Chakradhar
“Spectral studies of Sm3+ and Dy3+ doped lithium cesium mixed alkali borate glasses”
J. Non-Cryst. Solids, 352, p3914-3922, 2006.
42. Y.C. Ratnakaram, N.V.Srihari, D. Tirupathi Naidu, A. Vijayakumar and R.P.S.
Chakradhar
“Spectroscopic investigations on Ho3+ doped mixed alkali phosphate glasses”, Optical
Materials, 30, p1635-1643, 2008.
43. Y.C. Ratnakaram, N.V.Srihari, D. Tirupathi Naidu, A. Vijayakumar and R.P.S. Chakradhar
“Optical absorption and photoluminescence properties of Nd3+ doped mixed alkali phosphate glasses-spectroscopic investigations” Spectrochimica Acta Part A:Molecular and Biomolecular Spectroscopy, 72, p171-177, 2009.
44. G. N. Hemanth Kumar, J. Lakshmana Rao, K. Ravindra Prasad and Y.C.Ratnakaram
“Fluorescence and Judd-Ofelt analysis of Nd3+ doped mixed alkali phosphate glass”
Journal of Alloys and Compounds, 480, 208-215, 2009.
45. G. N. Hemanth Kumar, R.P.S. Chakradhar, M. Seshadri, J. Lakshmana Rao, and Y.C.Ratnakaram
“Effect of Dy3+ concentration on absorption and fluorescence properties in sodium potassium
mixed alkali phosphate glass” communicated to Bulletin of Material Sciences, 2008.
46. M. Seshadri, K. Venkata Rao, J. Lakshmana Rao and Y. C. Ratnakaram
“Spectroscopic and laser properties of Sm3+ doped different phosphate glasses” accepted for publication in Journal of Alloys and Compounds, 476, 263-270, 2009.
47. Vijaya Singh, D. Tirupathi Naidu, R. P. S. Chakradhar and Y. C. Ratnakaram , Jun-Jie Zhu and Manish Soni
“Synthesis, Characterization and optical properties of LaAlO3: Ho3+ phosphor” Physica B:
Condensed Matter, 403, 3781-3785, 2008.
48. G. N. Hemantha Kumar, G. Parthasarathy, R. P. S. Chakradhar, J. Lakshmana Rao and
Y. C. Ratnakaram
“Electron paramagnetic resonance studies on clinochlore from longitudinal valley area, Northeastern Taiwan”, Physics and Chemistry of Minerals, 36 (447-453), 2009.
49. M. Seshadri, K. Venkata Rao, J. Lakshmana Rao, K.S.R. Koteswara Rao and Y. C.
Ratnakaram
“Spectroscopic investigations and luminescence spectra of Nd3+ and Dy3+ doped different
phosphate glasses” J. Luminescence 130, 536-543, 2010.
50 G. N. Hemantha Kumar, G. Parthasarathy, R. P. S. Chakradhar, J. Lakshmana Rao and
Y. C. Ratnakaram
“Temperature dependence on the electron paramagnetic resonance spectra of natural Jaspar from Taroko Gorge (Taiwan) ”, Physics and Chemistry of Minerals, DOI: 10.1007/s00269-009-0324-0, 2009.
51 M. Seshadri, K. Venkata Rao, G.N. Hemanth Kumar and Y. C. Ratnakaram
“Optical spectra and Judd-Ofelt analysis of Pr3+ and Er3+ in different phosphate glasses”
IOP Conf. Series : Materials Science and Engineering 2 012032, 2009.
52. K. Venkata Rao, M. Seshadri, C. Venkateswarlu and Y. C. Ratnakaram
“Spectroscopic Properties and Judd-Ofelt analysis of Sm3+ and Dy3+ doped chlorophosphate
glasses” IOP Conf. Series : Materials Science and Engineering 2, 012045, 2009.
53. K. Venkata Rao, Y. C. Ratnakaram, M. Seshadri and J. L. Rao
“Optical and luminescence studies of Pr3+ and Er3+ doped different phosphate glasses”
Physica B 405 2297-2304, 2010.
54. C. Venkateswarlu, G.N. Hemanth Kumar, M. Seshadri, Y. C. Ratnakaram, K.S.R. Koteswara
Rao and J. L. Rao
“Studies on optical absorption and photoluminescence properties of Pr3+ and Nd3+ doped
mixed alkali chloroborate glasses” J. Alloys and Compounds, 502 97-106, 2010.
55. M. Seshadri, Y. C. Ratnakaram, G.N. Hemanth Kumar and J.L Rao
“Optical absorption and photoluminescence properties of Eu3+ doped different phosphate
glasses” Phys. and Chem. Glasses, 52(1), 31-37, 2011
56. C. Venkateswarlu, M. Seshadri, D. Tirupathi Naidu and Y. C. Ratnakaram
“Spectral investigations on Ho3+ doped mixed alkali chloroborate glasses” Brazilian Journal of Physics, 41,281-289, 2011.
57. C. Venkateswarlu, M. Seshadri and Y. C. Ratnakaram
“Influence of mixed alkalis on spectroscopic parameters of Sm3+ and Dy3+ doped chloroborate
glasses”, Optical Materials, 33, 799-806, 2011.
58. M. Seshadri, Y.C. Ratnakaram, D. Tirupathi Naidu, and K. Venkata Rao
“Investigations of spectroscopic properties (absorption and emission) of Ho3+ doped alkali,
mixed alkali and calcium phosphate glasses” Optical Materials 32, 535-542, 2010.
59. K.Venkata Rao, M. Seshadri and Y.C.Ratnakaram
“Emission properties of Eu3+ doped different chlorophosphate glasses”, American Institute of
Physics, Conf. Proce., 1349, 531-532 (2011).
60. D.Rajesh, Y.C.Ratnakaram, M. Seshadri, A. Balakrishna and T. Satya Krishna
“Structural and luminescence properties of Dy3+ ion in strontium lithium bismuth borate
glasses” J. Luminescence, 132, 841-849, 2011.
61. D.Rajesh, M. Seshadri, A. Balakrishna and Y.C.Ratnakaram
“Luminescence, structural and dielectric properties of Sm3+ impurities in strontium lithium
bismuth borate glasses” Optical materials, 35,108-116, 2012.
62. D.Rajesh, A. Balakrishna and Y.C.Ratnakaram
“Spectroscopic investigations on Pr3+ and Nd3+ doped Strontium lithium bismuth borate
glasses”, Spectrochemica Acta Part A, 97, 963-974, 2012.
63 Y. C.Ratnakaram A. Balakrishna, D. Rajesh
“Effect of modifier oxides on absorption and emission properties of Eu3+doped different
lithium fluoro- borate glass matrices” Physica B, 407, 4303-4307 2012.
64. A. Balakrishna D. Rajesh, and Y. C.Ratnakaram
“Structural and photoluminescence properties of Dy3+ doped different modifier oxide based
lithium borate glasses” Journal of Luminescence, 132, 2984-2991, 2012.
65. Y. C.Ratnakaram A. Balakrishna, D. Rajesh and M. Seshadri
“Influence of modifier oxides on spectroscopic properties of Sm3+ doped lithium
fluoroborate glass” J. Molecular Structure, 1028, 141-147, 2012.
66. D. Rajesh, Y. C.Ratnakaram , M. Seshadri and A. Balakrishna
“Luminescence properties of Sm3+ impurities in strontium lithium bismuth borate glasses”
American Institute of Physics, Conf. Proce., 1447, 581, 2012.
67. D. Rajesh, Y.C. Ratnakaram and A. Balakrishna
“Er3+ -doped strontium lithium bismuth borate glasses for broadband 1.5 μm emission –
Structural and Optical properties” J. Alloys and Compounds, 563, 22-27, 2013
68. Y.C. Ratnakaram, A. Balakrishna and D. Rajesh.
“Investigations Influence of modifier oxides on structural, thermal and optical properties of Er3+ doped lithium fluoroborate glass” Journal of Physics and chemistry of Glasses: Europian Journal of Glass Science Technology B, 54 (5), 216–222, 2013.
69. M.V. Sasi Kumar, D. Rajesh, A. Balakrishna Y.C. Ratnakaram
“Thermal and optical properties of Nd3+ doped lead zinc borate glasses-Influence of alkali
metal ions” Physica B 415, 67, 2013.
70. M.V. Sasi kumar, D. Rajesh, A. Balakrishna Y.C. Ratnakaram
“Optical absorption and photoluminescence properties of Dy3+ doped heavy metal borate
glasses Effect of modifier oxides” J. Molecular Structure 1041, 100, 2013.
71. D. Rajesh, M. Dhamodar Naidu, A. Balakrishna and Y.C. Ratnakaram
“Ho3+ doped strontium aluminum bismuth borate glasses for green light emission”
Luminescence: The Journal of Biological and Chemical Luminescence,29, 854-860, 2014.
72. A. Balakrishna, D. Rajesh and Y.C. Ratnakaram
“Structural and optical properties of Nd3+ in lithium fluoro-borate glass with relevant modifier
oxides” Optical Materials 35, 2670-2676, 2013.
73. A. Balakrishna, D. Rajesh and Y.C. Ratnakaram
“Spectroscopic analysis of Ho3+ ion transitions in different modifier oxide based lithium-
fluoro-borate glasses” Physica B 450, 58–66, 2014.
74. D. Rajesh M. Dhamodhara Naidu and Y.C. Ratnakaram
“Synthesis and photoluminescence properties of NaPbB5O9:Dy3+ phosphor material for white
light applications”, Journal of Physics and Chemistry of Solids, 75, 1210-1216, 2014.
75. D. Rajesh M. Dhamodhara Naidu and Y.C. Ratnakaram
“PbMoO4: Eu3+ red phosphor material for potential applications in white Light emitting
Diodes”, Indian Journal of Physics, 88, 1291-1297, 2014.
76. S. Babu, A. Balakrishna, D. Rajesh and Y.C. Ratnakaram
“Investigations on luminescence performance of Sm3+ ions activated in multicomponent
fluoro-phosphate glasses”. Spectrochimica Acta Part A: Molecular and Biomolecular
Spectroscopy 122, 639, 2014.
77. K. Brahmachary, D. Rajesh, S. Babu and Y.C. Ratnakaram
“Investigations on spectroscopic properties of Pr3+ and Nd3+ doped zinc-alumino-sodium-
phosphate (ZANP) glass”, J. Molecular Structure, 1064, 6-14, 2014.
78. M. Damodara Naidu, D. Rajesh, A. Balakrishna and Y.C. Ratnakaram
“Kinetics of fluorescence properties of Eu3+ ion in strontium-alluminium bismuth borate
Glass”, Journal of Rare earths 32, 1141, 2014.
79. M. Seshadri, E.F. Chillcce, J.D. Marconi, F.A. Sigoli, Y.C. Ratnakaram, L.C. Barbosa
“Optical characterization, infrared emission and visible up conversion in Er3+ doped tellurite
Glasses”, Journal of Non-Crystalline Solids 402, 141–148, 2014.
80. S. Babu, A. Balakrishna, D. Rajesh and Y.C. Ratnakaram
“Dy3+ doped oxy-fluoride phosphate glasses for laser materials: A photoluminescence study”
International Journal of Chem Tech Research 6 (6), 3276-3279, 2014
81. K. Brahmachary, D. Rajesh, A. Balakrishna and Y.C. Ratnakaram
“Radiative properties and energy transfer mechanism of Sm3+ ion in zinc-alumino-sodium-
phosphate (ZANP) glasses”, International Journal of Chem Tech Research 6 (6),1705-1707,
2014.
82. S. Babu, V. Reddy Prasad, D. Rajesh and Y.C. Ratnakaram
“Luminescence properties of Dy3+ doped different fluoro-phosphate glasses for solid state
lightening applications” J. Molecular Structure 1080, 153-161, 2015.
83. M. Seshadri, M. Radha, D. Rajesh, L.C. Barbosa, C.M.B. Cordeiro and Y.C. Ratnakaram
“Effect of ZnO on spectroscopic properties of Sm3+ doped zinc Phosphate glasses”, Physica
B 459, 79-87, 2015.
84. K. Brahmachary, D. Rajesh and Y.C. Ratnakaram
“Radiative properties and Luminescence spectra of Sm3+ ion in zinc-aluminium-sodium-
phosphate (ZANP) glasses” Journal of Luminescence, 161(2015) 202-208.
85. K. Brahmachary, D. Rajesh and Y.C. Ratnakaram
“Luminescence properties of Dy3+ doped zinc-aluminium-sodium-phosphate (ZANP) glasses for white light applications” Optik, 126 (2015) 4050–4055.
86. S. Babu, M. Seshadri, V. Reddy Prasad and Y.C. Ratnakaram
“Spectroscopic and laser properties of Er3+ doped fluoro-phosphate glasses as promising
candidates for broad band optical fiber lasers and amplifiers” Materials Research Bulletin,
70(2015) 935- 944.
87. V. Reddy Prasad, S.Babu, D. Rajesh and Y.C. Ratnakaram
“Optical investigations of Sm3+ doped lead free zinc phosphate glasses for reddish orange
luminescence applications” Phys. and Chem. Glasses, 56(4)(2015) 159-168.
88. S. Babu, M. Seshadri, A. Balakrishna, V. Reddy Prasad and Y.C. Ratnakaram
“Study of multicomponent fluoro-phosphate based glasses: Ho3+ as a luminescence centre”
Physica B 479 (2015) 26–34
89. M. Seshadri, L.C. Barbosa, C.M.B. Cordeiro, M. Radha, F.A. SIgoli and Y.C. Ratnakaram
“Study of optical absorption, visible emission and NIR-VIS luminescence spectra of Tm3+/Yb3+,
Ho3+/Yb3+ and Tm3+/Yb3+/Ho3+ doped tellurite glasses”, J. Luminescence, 166(2015)8-16.
90. K. Venkata Rao, S. Babu, G. Venkataiah and Y.C. Ratnakaram
“Optical spectroscopy of Dy3+ doped borate glasses for luminescence applications”, J. Molecular
Structure, 1094(2015)274-280.
91. K. Naveen Kumar, J.L. Rao and Y.C. Ratnakaram
“Optical, magnetic and electrical properties of multifunctional Cr3+ : Polyethylene oxide (PEO)
+ Poly vinyl pyrrolidone(PVP)polymer composites” Journal of Molecular Structure, 1100
(2015) 546-554.
92. K. Naveen Kumar, L. Vijayalakshmi and Y.C. Ratnakaram
“Energy transfer based photoluminescence properties of (Sm3+ and Eu3+) : PEO+PVP polymer
films for red luminescent display device applications”, Optical Materials, 45(2015) 148-155.
93. K. Naveen Kumar, M. Vasudeva Reddy, L. Vijayalakshmi and Y.C. Ratnakaram
“Synthesis and analysis of Fe3+, Co3+ and Ni3+: PEO+PVP blended polymer composite films for
multifunctional polymer applications” Bulletin of Materials Science, 38, 1015-1023 (2015).
94. D. Rajesh, K. Brahmachary, Y.C. Ratnakaram, N. Kiran, A.P. Baker, Gui-Gen Wang,
“Energy transfer based emission analysis of Dy3+/Eu3+ co-doped ZANP glasses for white
LED applications”, Journal of Alloys and Compounds, 646, (2015), 1096-1103.
95. K.Naveen kumar, Misook Kang, K.Sivaiah, M.Ravi and Y.C.Ratnakaram
“Enhanced electrical properties of polyethyleneoxide (PEO)+polyvinyl pyrrolidone(PVP) : Li+
blended polymer electrolyte films with addition of Ag nanofiller” Ionics, 22:815-825
(2016).
96. K. Naveen Kumar, Misook Kang, G. Bhaskara Kumar, Y.C. Ratnakaram
“Energy transfer based photoluminescence properties of co-doped (Er3+ + Pr3+): PEO +
PVP blended polymer composites for photonic applications” Optical Materials, 54 (2016)
6–13
97. V. Reddy Prasad, S. Babu, V.V. Ravikanth Kumar and Y.C.Ratnakaram
“Luminescence performance of Eu3+-doped lead-free zinc phosphate
glasses for red emission” Bulletin of Mat. Science, No.4, 1065-1072 (2016)
98. V. Reddy Prasad, S. Babu and Y.C.Ratnakaram
“Concentration dependent luminescence properties of Dy3+ doped lead free zinc phosphate
glasses for visible applications” Indian Journal of Physics, 90, 1173-1182, 2016.
99. Y.C. Ratnakaram, S. Babu, L. Krishna Bharat, C. Nayak
“Fluorescence characteristics of Nd3+ doped multicomponent fluoro-phosphate glasses for
potential solid-state laser applications” J. of Luminescence, 175, 57-66, 2016.
100. M.Seshadri, A.Virgillio, M.J.V. Bell, L.C. Barbosa, G. Bosco, L.R.Tessler, J. Suresh Kumar,
M.P.F. Graca, M.J. Soares, M.Radha and Y.C.Ratnakaram
“Doped Tellurite Glasses:Extending Near –Infrared Emission for Near 2.0 um Amplifiers”
International National J. Applied Glass Science, 1-11(2016).
101. S. Babu, P. Rajput and Y.C.Ratnakaram
“Compositional dependent properties of Pr3+ doped multicomponent fluoro-phosphate glasses
for visible applications : a photoluminescence study” J. Materials Science, 51:8037– 8054
(2016).
102. M.V. Sasi Kumar, B.R. Reddy, S.Babu, A. Balakrishna and Y.C.Ratnakaram
“Thermal, Structural and spectroscopic properties of Pr3+ ion doped in lead-zinc borate glasses
modified by alkali metal ions”, Journal of Taibah University for Science, 11, 593-604, (2017).
103. A. Balakrishna, S.Babu, Vinod Kumar, O.M. Ntwaeborwa and Y.C.Ratnakaram
“Optical properties and spectroscopic study of different modifier based Pr3+:LiFB glasses as optical amplifiers” Spectrochemica Acta Part A : Molecular and Biomolecular Spectroscopy, 167-173, 170 (2017).
104. K. Naveen Kumar, K. Saijyothi, Misook Kang, Y.C.Ratnakaram, K.Hari Krishna, Dahee
Jin,Yong Min Lee
“Improved electrical properties of Fe nanofiller impregnated PEO+PVP:Li+ blended polymer electrolytes for lithium battery applications” Appl. Phys. A 122:698 (2016).
105. V. Reddy Prasad, M. Seshadri, S. Babu, Y.C. Ratnakaram
“Concentration dependent studies of Nd3+ doped zinc phosphate glasses for NIR
photoluminescence at 1.05 μm”. Luminescence: The Journal of Biological and Chemical
Luminescence, 32, 443-451, 2017.
106. Y.C.Ratnakaram, S. Babu, L.Krishna Bharat and C. Nayak
“Fluorescence Characteristics of Nd3+ doped multicomponent fluorophosphates glasses for
potential solid state laser applications” J. Luminescence, 57-66, (2016).
107. K. Anil Kumar, S. Babu, V. Reddy Prasad, S. Damodaraiah and Y.C.Ratnakaram
“Optical response and luminescence characteristics of Sm3+ and Tb3+/Sm3+ co-doped potassium fluorophosphates glasses for reddish-orange lighting applications”, Materials Research Bulletin, 90, 31-40, 2017
108. V. Reddy Prasad, S. Damodaraiah, S. Babu and Y.C.Ratnakaram
“Intense orange emission in Pr3+ and NIR emission at 1.53 um in Er3+ doped zinc phosphate glasses for potential broadband optical amplifier”, Indian Journal of Physics, 48, 1037-1048, 2017.
109. S. Damodaraiah, V. Reddy Prasad, S. Babu and Y.C.Ratnakaram
“Structural and luminescence properties of Dy3+ doped bismuth phosphate glasses for greenish yellow light applications”, Optical Materials, 67,14, 2017
110. M.V. Sasi Kumar, S. Babu, B. Rajeswara Reddy and Y.C.Ratnakaram
“Study of structural and spectroscopic behavior of Sm3+ ions in lead zinc borate glasses containing alkali metal ions” Indian Journal of Physics, 91, 6, 677-687, 2017.
111. V. Reddy Prasad, S. Damodaraiah, S. Babu and Y.C.Ratnakaram
“Structural, optical and luminescence properties of Sm3+ and Eu3+ doped calcium borop hosphate phosphors for reddish-orange and red emitting light applications”, Journal of Luminescence, 187, 360-367, 2017.
112. S. Damodaraiah, V. Reddy Prasad, S. Babu and Y.C.Ratnakaram
“Impact of Bi2O3 on structural properties and lasing effects in Nd3+ doped bismuth phosphate glasses at 1.053mu NIR emission”, Spectrochimica Acta Part A, 181, 264, 2017.
113. K. Anil Kumar, S. Babu, V. Reddy Prasad, S. Damodaraiah and Y.C.Ratnakaram
“Spectral investigations on Sm3+, Eu3+ doped and Sm3+/Eu3+ co-doped potassium fluorophosphates glasses emitting intense orange-red for lighting applications”, Luminescence : The Journal of Biological and Chemical Luminescence, doi;10.1002/bio 3345, 2017.
114. K. Naveen Kumar, R. Padma, Y.C.Ratnakaram, Misook Kang,
“Bright green emission from f-MWCNT embedded co-doped Bi3++Tb3+: Polyvinyl alcohol
Polymer nanocomposites for photonic applications” RSC Advances 7, 15084-15095, 2017.
115. M. Parandamaiah, K. Naveen Kumar S. Babu, S. Venkatramana Reddy and Y.C.
Ratnakaram
“Dy3+ doped Lithium Sodium Bismuth Borate Glasses for Yellow Luminescent Photonic
Applications”, International Journal of Engineering and Research Applications (IJERA), 5(8),
(Part-4) 126-131. ISSN: 2248-9622, 2015 .
116. S. Damodaraiah, V.Reddy Prasad and Y.C.Ratnakaram
“Structural and luminescence properties of Sm3+ doped bismuth phosphate glasses for orange
red laser applications” Luminescence : The Journal of Biological and Chemical
Luminescence, 1-10, https://doi.org/10.1002/bio345/ . 2018.
117. B. Haritha, V. Reddy Prasad, S. Damodaraiah and Y.C. Ratnakaram
“Spectroscopic properties of Pr3+ ions embedded in different multicomponent phosphate
Glasses” American Journal of Engineering Research, Vol.6, Issue 7 pp :315-322, 2017
118. V. Reddy Prasad, S. Damodaraiah and Y.C.Ratnakaram
“Structural and luminescence properties of Sm3+/Eu3+ codoped 2CaO-B2O3-P2O5 phosphors : Energy transfer mechanism and enhancement of red luminescence by temperature” International Journal of Current Advanced Research, Vol.6 Issue 8, pp : 2017.
119. S. Damodaraiah, V. Reddy Prasad and Y.C. Ratnakaram
“Investigation of 1.53 um emission characteristics of Er3+ doped bismuth phosphate glasses for laser applications” J. Alloys and Compounds, 741, 269-280, 2018.
120. K.Anil Kumar, S. Babu, V. Reddyprasad, S. Damodaraiah and Y.C.Ratnakaram
“Emission spectra and energy transfer studies in Dy3+ and Dy3+/Eu3+ co-doped potassium
fluoro-phosphate glasses for white light applications” J. Luminescence, 205, 190-196, 2019.
121. V. ReddyPrasad, S. Damodaraiah, S.N. Devara and Y. C. Ratnakaram
“Photoluminescence studies on Holmium (III) and Praseodymium (III) doped calcium
borophosphate (CB) phosphors” J. Molecular Structure, 1160, 383-392, 2018.
122. V. Reddy Prasad, S. Damodaraiah and Y.C. Ratnakaram
“Optical spectroscopy and luminescence properties of Ho3+ doped zinc fluorophosphates
(ZFP)glasses for green luminescent device applications” Optical Materials, 78, 63-71, 2018.
123. B. Haritha, S. Damodaraiah, V. Reddy Prasad and Y.C. Ratnakaram
“Investigations of near infrared luminescence properties of ER3+ doped different phosphate
glasses for optical amplifier applications” Int. Nat. J. of Current Advanced Research, Vol.6
2341-47. 2017.
124. B. Haritha, S. Damodaraiah, V. Reddy Prasad and Y.C. Ratnakaram
“Spectral investigations and emission properties of Ho3+ doped different phosphate glasses for 2 um laser materials” Int. Nat. J. Engg. Sci. Invention, Vol.7, Issue 5, 7-17, May 2018.
125. B. Haritha, S. Damodaraiah, V. Reddy Prasad and Y.C. Ratnakaram
“Spectroscopic properties of Pr3+ ions embedded in different multi component phosphate glasses” Ame. J. Engg. Research, Vol. 6, Issue 7, 315-322, 2017.
126. M. Damodara Naidu and Y.C. Ratnakaram
“Optical investigations of Pr3+ ion doped in strontium aluminium bismuth borate glasses for
optical application” J. Appl. Spectroscopy, Vol. 86, No.4, July 2019.
127. V. Reddy Prasad, B. Haritha, S. Damodaraiah, and Y.C. Ratnakaram
“Influence of Nd3+ and Er3+ concentration on NIR luminescence properties in calcium
borophosphate phosphors” Infrared Physics and Technology, Vol. 94,184-190, 2018.
128. B. Nagaraja Naick, V. Reddy Prasad, S. Damodaraiah, A. V. Reddy and Y.C. Ratnakaram
“Absorption and luminescence studies of Sm3+ ions activated in distinct phosphate glasses for
reddish orange light applications” Optical Materials. Vol.88, 7-14, 2019.
129. S. Damodaraiah, and Y.C. Ratnakaram
“Energy transfer studies and neutral to warm white light generation in Dy3+ -Sm3+ codoped
bismuth phosphate glasses for lighting applications” Journal of Luminescence, Vol. 207,
553-560, 2019.
130. S. Damodaraiah, V. Reddy Prasad and Y.C. Ratnakaram
“Investigations on spectroscopic properties of Nd3+ doped alkali bismuth phosphate glasses for
1.053 laser applications” Optics and Laser Technology, Vol.113, 322-329, 2019.
131. S. Damodaraiah, V. Reddy Prasad, R.P.Vijaya Lakshmi and Y.C.Ratnakaram
“Luminescence behavior and phononside band analysis of europium doped Bi2O3 based
phosphate glasses for red emitting device applications” Optical Materials, Vol. 92, 352-358,
2019.
132. B. Nagaraja Naick, V. Reddy Prasad, S. Damodaraiah, and Y.C. Ratnakaram
“Judd-Ofelt analysis and luminescence studies on Dy3+ doped different phosphate glasses for
white light emitting material applications” Optik : Int. Nat. J. Optics, 192, 162980 (2019).
133. V. Reddy Prasad, S. Damodaraiah, and Y.C. Ratnakaram
“UV excited Dy3+ doped calcium borophosphate phosphors for white light applications”
Indian J. Physics, htts://doi.org/10.1007/s 12648-019-01671-9, 2020.
134. T. Raghuraman, V. Reddy Prasad, A.V.Reddy and Y.C.Ratnakaram
“Photoluminescence properties of Sm3+ doped LiPbB5O9 phosphor for reddish orange emitting
light applications” J. Luminescence 217, 116814, 2020
135. S. Damodaraiah, R.P.Vijaya Lakshmi and Y.C.Ratnakaram
“Role of bismuth content on structural and luminescence properties of Ho3+ doped phosphate glasses” J. Mol. Structure, 1200, 127157, 2020.
136. T. Raghuraman and Y.C.Ratnakaram
“Concentration dependent Dy3+ activated LiPbB5O9 phosphor: Strucutre and luminescence studies for white LED applications” Optical Materials,Vol. 99 (2020) 109515.
137. B. Nagaraja Naick, S. Damodaraiah, H. Nagabushana and Y.C. Ratnakaram
“Effect of Li, Mg and Sr on structural and photoluminescence properties of Nd3+ doped
phosphate glasses : solid state laser applications” Phys. Chem. Glasses, Part B, Vol. 61, No.2,
April 2020.
138. K. Venkata Rao, S. Babu, C. Balanarayana and Y.C. Ratnakaram
“Comparitive impact of Nd3+ ion doping concentration on near infrared laser emission in lead
borate glassy materials” Optik : International Journal of Light and Electron Optics, 202 (2020)
163562.
139. T. Raghu Raman, B. Devaprasad Raju and Y.C.Ratnakaram
“Synthesis and spectroscopic investigations on Pr3+ doped LiPbB5O9 phosphor: A blue
converting red phosphor for white LED’s” Optik : International Journal of Light and Electron
Optics, (2020).
140. B. Nagaraja Naick, B. Devaprasad Raju and Y.C.Ratnakaram
“Enhanced photoluminescence properties of Eu3+ doped different phosphate glasses for red-
orange light emission applications” Int. Nat. J. Advanced Research Vol.9, Issue 10, 134-143
(2020).
141. T. Raghu Raman, B. Devaprasad Raju and Y.C.Ratnakaram
“Photoluminescence investigations of Eu3+ doped LiPbB5O9 as a red emitting phosphor for
warm W-LED applications” Indian J. Physics (2020).
142. M. Kumar and Y.C.Ratnakaram
“Studies on impact of BaF2 and Bi2O3 on structural and emission properties of Nd3+ doped
fluorophosphates glasses for 1.058um emission” Optical Materials, 112, 110738 (2021).
143. A. Sudharani, K. Sunil Kumar, M. Ramanadha, Y.C.Ratnakaram, R.P.Vijayalakshmi
“Morphology driven enhanced photocatalytic activity of CuO/BiO nanocomposites” Mat.
Chem. Physics, 258, 123891 (2021).
144. T. Raguraman, R.P.Vijayalakshmi and Y.C.Ratnakaram
“Effect of Ho3+ ion concentration on structure and spectroscopic properties of LiPbB5O9 :
Ho3+ phosphor” J. Mol. Structure, 1243, 130759 (2021).
145. M. Ramanadha, K. Sunil Kumar, K. Subramanyam, Y.C. Ratnakaram, D. Amarnadha Reddy,
R.P.Vijayalakshmi, A. Sudharani
“Boosting solar driven hydrogen evaluation rate of CDS nano rods adorned with MoS2 and
SnS2 nanostructures” communicated to (2021).
146. M. Kumar and Y.C. Ratnakaram
“Infuence of alkali and alkaline earths on structural and luminescence properties of Sm3+ doped
lithium fluoro phosphate glass and different (Na, Mg, K, Ca and Sr) glass ceramics” J. Non-
Cryst. Solids, 573, 121146 (2021).
Books
Research interest
Optical Absorption and luminescence properties of rare earth doped glasses and phosphors for laser applications
Research projects
Two UGC minor research projects:
(1)“Optical absorption spectra and photoluminescence properties of certain rare earth doped glasses” during the period 1994-1996.
(2)“Mixed alkali effect – spectroscopic investigations – study of optical absorption and fluorescence spectra of rare earth doped glasses” during the period 1997-1999.
Three UGC major research projects:
(1) “Mixed alkali effect in borate glasses–Spectroscopic investigations–Study of optical absorption and fluorescence spectra of rare earth doped mixed alkali borate glasses” worth of Rs. 3.24 laks, during the period 2002-2005.
(2) “Characterization and laser analysis of rare earth doped glasses-Spectroscopic investigations on optical absorption and fluorescence spectra of rare earth doped glasses” worth of 8.30 laks, during the period 2007-2010.
(3) “Preparation, characterization and spectroscopic investigations on rare earth doped tellurite, phosphate and borate glasses for solid state laser applications” worth of Rs. 10.30 laks during the period 2011-14.
Conference
List of Seminars/Conferences/Workshops, Refresher Courses and Orientation Programmes:
1. “Spectral studies of praseodymium (III) and thulium(III) in certain sulphate glasses”
S.V.J. Lakshman and Y.C. Ratnakaram
Paper presented at 17th Rare Earth Research Conference, McMaster University, Hamilton, Canada, June, 1986.
2. “Optical absorption spectra and laser analysis of Nd (III) in fluoroborate glass”
Y.C. Ratnakaram and S. Buddhudu
Paper presented at “Workshop on Advanced Laser Spectroscopy” organised by Dept. of Physics, I.I.T, Kanpur, Feb. 1995.
3. “Spectroscopic investigations of Er(III) and Tm(III) in lead acetate glass”
Y.C. Ratnakaram and S. Buddhudu
Paper presented at “International Conference on Spectroscopy Perspectives and Frontiers”
Organised by BARC, Mumbai, Jan. 1996.
4. “Optical properties of Nd3+ ion doped H3BO3-Na2CO3-RCl glasses”
Y.C. Ratnakaram and N. Sudharani
Paper presented at “International Conference on Spectroscopy Perspectives and Frontiers” organised by BARC, Mumbai, Jan. 1996.
5. “Preparation and Characterization of Rare earth doped glasses for use in lasers”
Y.C. Ratnakaram and N. Sudharani
Presented at “VIIth Annual General Meeting of MRSI” held at I I Sc, Bangalore, Feb.1996.
6. Attended the Orientation Programme Organised by Academic Staff College, S.V. University, Tirupati, Dec. 1993.
7. Attended the Refresher Course in Physics, Organised by Academic Staff College, Andhra University, Visakhapatnam, Sept. 1995.
8. Attended the “Workshop on Astrophysical Spectroscopy” organised by Dept. of Physics, S.K. University, Ananthapur, Feb.1997.
9. “Optical absorption spectra and energy band studies of Praseodymium (III) in chloroborate glasses”
Y.C. Ratnakaram and A. Viswanadha Reddy
Paper presented at “DAE-BRNS Symposium on Spectroscopy of Lanthanides an Actinides (SLA99), BARC, Mumbai, Nov.1999.
10. “Electronic Spectra and Optical band gap studies in Neodymium Chlorophosphate glasses”
Y.C. Ratnakaram and A. Viswanadha Reddy
Paper presented at “DAE-BRNS Symposium on Spectroscopy of Lanthanides and Actinides (SLA99), BARC, Mumbai, Nov.1999.
11. Attended Refresher Course in Physics organized by Academic Staff College, S.V. University, Tirupati, Oct. 2000.
12. “Spectroscopic investigations of Tm3+ in different chlorophosphate glasses”
Y.C. Ratnakaram and A. Viswanadha Reddy
Paper Presented at “National Seminar on Solid State Spectroscopy (NSSSS-2001)” at S.V. University, Tirupati, Aug. 2001.
13. “Electronic absorption spectra and energy gap studies of Er3+ ions in different chlorophosphate glasses”
Y.C. Ratnakaram and A. Viswanadha Reddy
Paper Presented at “National Seminar on Solid State Spectroscopy (NSSSS-2001)” at S.V. University, Tirupati, Aug. 2001.
14. “Mixed alkali effect in borate glasses-Spectroscopic investigations- Study of optical absorption and fluorescence of Nd3+ in (Na2O)x (K2O) 30-x (B2O3) 70 Glasses”
Y.C. Ratnakaram, R.P.S. Chakradhar, K.P. Ramesh, J.L. Rao and J. Ramakrishna
Paper Presented at “44th DAE-Solid State Physics Symposium” at BARC, Trombay,
Mumbai, Dec. 2001.
15. “Mixed alkali effect in borate glasses – Optical absorption studies in Ho3+ in x (Na2O)(30-x) (K2O).70(B2O3 Glasses”
Y.C. Ratnakaram, R.P.S. Chakradhar, K.P. Ramesh, J.L. Rao and J. Ramakrishna
Paper Presented at “44th DAE-Solid State Physics Symposium” at BARC, Trombay,
Mumbai, Dec. 2001.
16. Attended the Refresher Course in Physics, Organised by UGC Refresher Course Centre, Department of Physics, Nagarjuna University, Nagarjunanagar, Aug. 2002.
17. “Influence of Nd3+ concentration on its optical absorption and luminescence properties in potassium borate glass”
Y.C. Ratnakaram, Md. Abdul Altaf, R.P.S. Chakradhar, J. Ramakrishna and J.
Lakshmana.Rao
Paper Presented at National Seminar on “Recent trends in Optoelectronic materials and devices” at S.V. University, Tirupati, Nov. 21-22, 2002.
18. Attended National seminar on “Atmospheric Sciences and Spectroscopic Techniques”, Organised by Dept. of Physics, S.K. University, Ananthapur, July 29-30, 2003.
19. “Electronic spectra of Pr3+ doped mixed alkali borate glasses”.
Y.C. Ratnakaram, A. Vijaya Kumar, D. Tirupati Naidu and R.P.S. Chakradhar.
Presented at National Laser Symposium, IIT, Karagpur, Dec. 22-24, 2003.
20. “Characterisation of Tm3+ doped mixed alkali borate glasses – Spectroscopic Investigations”.
Y.C. Ratnakaram, D. Tirupati Naidu, A. Vijaya Kumar and R.P.S. Chakradhar
Presented at National Laser Symposium, IIT, Karagpur, Dec. 22-24, 2003.
21. “Compositional dependencies of optical absorption and emission properties of Pr3+ in mixed
alkali borate glasses”.
Y.C. Ratnakaram, D. Tirupati Naidu, A.Vijaya Kumar and N.O. Gopal.
Paper presented at “National Conference on Current Trends in Condensed Matter Research” Kakatiya University, Warangal. Sept. 20-22, 2004.
22. “The effect of mixed alkalies on absorption and fluorescence properties of Ho3+ ions in borate glasses”
Y.C. Ratnakaram, D. Tirupati Naidu, A. Vijaya Kumar and J.L. Rao.
Paper presented at “National Conference on Current Trends in Condensed Matter Research” Kakatiya University, Warangal. Sept. 20-22, 2004.
23. “Studies on optical absorption and luminescence properties of Dy3+ doped mixed alkali borate glasses”
Y.C. Ratnakaram, D. Tirupati Naidu, A. Vijaya Kumar and J.L. Rao.
Paper presented at “National Seminar on Physics of Non-Crystalline Materials” organised at Acharya Nagarjuna University P.G. Centre, Nuzvid. Dec. 29-31, 2004.
24. Attended IX Workshop on “Neutrons as Probes in Condensed Matter Physics” organized by Baba Atomic Research Centre, Mumbai, Jan 27-29, 2005.
25. Attended National Seminar on “Atmospheric Science” organized by Dept. of Physics,
S.K. University, Ananthapur, Feb 25-26, 2006.
26. “Optical absorption and emission properties of Pr3+ and Er3+ in mixed alkali borate glasses”
A. Vijaya Kumar, D. Tirupati Naidu, R.P.S.Chakradhar and Y.C. Ratnakaram
Paper presented at “International Symposium on Non-oxide and new optical Glass
(ISNOG)” organized by Dept. of Physics, I I Sc, Bangalore, April 10 -14, 2006.
27. “Spectral studies of Sm3+ and Dy3+ doped lithium cesium mixed alkali borate glasses”
D. Tirupathi Naidu, A. Vijaya Kumar, R.P.S.Chakradhar and Y.C. Ratnakaram
Paper presented at “International Symposium on Non-oxide and new optical Glass
(ISNOG)” organized by Dept. of Physics, I I Sc, Bangalore, April 10 -14, 2006.
28. “Optical absorption and photoluminescence properties of Er3+ doped mixed alkali borate glasses”
Y.C.Ratnakaram, A.Vijayakumar, D.Tirupathi Naidu and R.P.S.Chakradhar
Paper presented at 6th “National Laser Symposium” (NLS-6) organized at RRCAT, Indore,
December 5-8, 2006.
29. “Absorption and emission properties of Sm3+ ions in mixed alkali borate glasses”
D. Tirupathi Naidu, A. Vijaya Kumar, R.P.S.Chakradhar and Y.C. Ratnakaram
Paper presented at 6th “National Laser Symposium” (NLS-6) organized at RRCAT, Indore,
December 5-8, 2006.
30. “Optical absorption spectra and spectroscopic investigations on Nd3+ and Sm3+ doped borate glasses”.
K. Sireesha, D. Tirupathi Naidu, A. Vijaya Kumar and Y. C. Ratnakaram
Paper presented at National Seminar on Advances in Amorphous Materials, A.N.U. P.G.
Centre, NUZVID, February 1-3, 2007.
31. “EPR and infrared spectral studies on chlorite mineral from tairoko gore mountains of
Taiwan” .
G. N. Hemantha Kumar, Y. C. Ratnakaram and J. Lakshmana Rao
Paper presented at International Conference on Advanced Materials and Applications (ICAMA-2007), Shivaji University, Kolhapur, November 15-17, 2007
32. “Concentration effect and spectroscopy of Nd3+ in sodium potassium mixed alkali phosphate glass”.
G. N. Hemantha Kumar, Y. C. Ratnakaram and J. Lakshmana Rao
Paper presented at International Conference on Materials Science Research and Nanotechnology (ICMSRN-2008), Mother Theresa Women’s University, Kodaikanal, February 27-29, 2008.
33. “Concentration effect and spectroscopy of Dy3+ in sodium potassium mixed alkali phosphate glass”.
G. N. Hemantha Kumar, R. P. S. Chakradhar, M. Seshadri, J. Lakshmana Rao and
Y. C. Ratnakaram Paper Presented at “National Symposium on Science & Technology of glass and glass ceramics” (NSGC – 08), BARC, Mumbai, October 13-15, 2008.
34. “Spectroscopic investigations on Nd3+ doped alkali, mixed alkali and calcium phosphate glasses”
M. Seshadri, G. N. Hemantha Kumar, A. Vijaya kumar, K.S.R. Koteswara Rao and
Y. C. Ratnakaram Paper Presented at “National Symposium on Science & Technology of glass and glass ceramics” (NSGC – 08), BARC, Mumbai, October 13-15, 2008.
35. “Effect of mixed alkalis on absorption and emission properties of Pr3+ in chloroborate glasses”.
C. Venkateswarlu, N. V. Srihari, K. Venkata Rao and Y.C. Ratnakaram Paper
presented at 53rd DAE-Solid State Physics Symposium 2008, BARC, Mumbai, December 16-20,2008.
36. “Charecterization of Ho3+ doped alkali, mixed alkali and calcium phosphate glasses”
Y.C. Ratnakaram, M. Seshadri, D. Thirupati Naidu, K. Venkata Rao,
Paper presented at 53rd DAE-Solid State Physics Symposium 2008, BARC, Mumbai,
December 16-20,2008.
37. “Absorption and photoluminescence studies of Sm3+ sodium potassium mixed alkali
phosphate glass”.
G. N. Hemantha Kumar, Y. C. Ratnakaram, J. Lakshmana Rao, R. P.S. Chakradhar
Paper presented at ‘National Conference on Luminescence and its Applications” (NCLA –
2009) at CGCRI, Kolkata, February 19-21, 2009.
38. “Optical spectra and Judd-Ofelt analysis of Pr3+ and Er3+ in different phosphate glasses”
M. Seshadri, K. Venkata Rao, G.N. Hemantha Kumar and Y.C. Ratnakaram
Paper presented at “International Seminar on Science and Technology of Glass Materials 2009” at A.N.University, Guntur, March 16 – 19, 2009.
39. “Spectroscopic properties and Judd-Ofelt analaysis of Sm3+ and Dy3+ doped chlorophosphate
glasses”
K. Venkata Rao, M. Seshadri, C. Venkateswarlu and Y.C. Ratnakaram
Paper presented at “International Seminar on Science and Technology of Glass Materials
2009” at A.N. University, Guntur, March 16 – 19, 2009.
40. “Spectroscopic investigations on Dy3+ doped different phosphate glasses”
M. Seshadri, K. Venkata Rao, J.L.Rao and Y.C. Ratnakaram
Paper presented at “DAE Solid State Physics Symposium”, The Maharaja Sayajirao
University of Baroda, Vadodara. Dec. 14-18, 2009
41. “Optical and luminescence properties of Pr3+ and Er3+ doped phosphate glasses”
K. Venkata Rao, Y.C. Ratnakaram M. Seshadri and J.L.Rao
Presented at “National Conference on Materials for energy storage and Conversion”, S.V.University, Tirupathi, Jan 23-24, 2010.
42. “Fluorescence and absorption spectral studies of Eu3+ in different glass matrices”
Y.C.Ratnakaram, G.N. Hemanth Kumar and J.L.Rao
Paper presented at “International workshop and symposium on the synthesis and characterization of Glass/Glass-ceramics (IWSSCGGC-2010)” C-MET, Pune July 7-10 2010.
43. Spectral investigations on Ho3+ doped mixed alkali chloroborate glasses”
M. Seshadri, C. Venkateswarlu, D. Tirupathi Naidu and Y.C. Ratnakaram
Paper presented at “International Conference on Multifunctional Materials (ICMM-2010), BHU, Varanasi, Dec. 6-9, 2010.
44. “Emission properties of Eu3+ doped different chlorophosphate glasses”
K. Venkata Rao, Y.C. Ratnakaram M. Seshadri
Paper presented at “55th DAE Solid State Physics Symposium”, Manipal University, Manipal, Dec 26-30, 2010.
45. “Structural and luminescence properties of Dy3+ ions in strontium fluoro bismuth borate glasses”
D.Rajesh, Y.C.Ratnakaram, M.Seshadri, A.Balakrishna and T. Satya Krishna
Paper presented at “International Conference on Speciality Glass & Optical Fiber: Materials, Technology & Devices ICGF-2011, CGCRI, Kolkata, Aug. 4-6, 2011.
46. “Influence of modifier oxide on spectroscopic properties of Sm3+ doped lithim fluoro-borate glass system”
A.Balakrishna D.Rajesh, Y.C.Ratnakaram, and M.Seshadri,
Paper presented at “International Conference on Specialty Glass & Optical Fiber : Materials,
Technology & Devices ICGF-2011, CGCRI, Kolkata, Aug. 4-6, 2011.
47. “Luminescence, structural and dielectric properties of Sm3+ impurities in strontium lithium
bismuth borate glasses”
D. Rajesh, M. Seshadri, A. Balakrishna and Y. C.Ratnakaram
Paper presented at “56th DAE Solid State Physics Symposium” SRM University,
Chennai, during Dec 19-23, 2011.
48 “Structural and photoluminescence properties of Dy3+ doped heavy metal oxide based
lithium fluoro-borate glasses”
A.Balakrishna D.Rajesh, Y.C.Ratnakaram and M.Seshadri,
Paper presented at “4th International Conference on Luminescence and its Applications” (ICLA-2012), IICT, Hyderabad, during Feb. 7-10, 2012.
49 “Spectroscopic investigations on Pr3+ and Nd3+ doped strontium lithium bismuth borate
glasses”
D. Rajesh, M. Seshadri, A. Balakrishna and Y. C.Ratnakaram
Oral presentation at “International Conference on Recent trends in Advanced
Materials (ICRAM-2012)” VIT, Chennai, during Feb. 20-22, 2012.
50 “Structural and optical properties of Eu3+ doped lithium fluoro-borate glasses containing
different modifier oxides”
A. Balakrishna, Y.C. Ratnakaram, D. Rajesh and M. Seshadri
Paper presented at “International conference on materials science and technology (ICMST-
2012)” St. Thomas College, Kerala, during June 10-14, 2012.
51 “Structural, thermal and spectroscopic investigations on Er3+ doped different modifier oxides
based lithium fluoro-borate glasses”
A.Balakrishna, D. Rajesh and Y.C. Ratnakaram
Paper presented at “Advances in materials science and technologies”, Kakatiya University,
Warangal, Nov. 19-21, 2012.
52 “Er3+ doped strontium lithium bismuth borate glasses for broadband 1.5 μm emission -Optical
Properties”
D. Rajesh A. Balakrishna and Y.C. Ratnakaram
Paper presented at “57th DAE Solid State Physics Symposium” IIT Bombay, Mumbai, during
Dec 3-7, 2012.
53 “Structural investigations and Luminescence efficiency of Nd3+ doped lithium fluoro
borate glass with different modifier oxides”
A. Balakrishna, D. Rajesh and Y.C. Ratnakaram
Poster presentation at “National Conference on Advanced Materials and applications (NCAMA-
2013)”, held at National Institute of Technology, TAMILNADU, during April 4-5, 2013.
54 “Spectroscopic investigation on Nd3+ doped lithium fluoro borate glass with different
modifier oxides for solid state laser applications”
A. Balakrishna, D. Rajesh and Y.C. Ratnakaram
Poster presentation at “International conference on recent advances in physics 2013”, held at
Sri Vidyamandir Arts and Science College, TAMILNADU, during August 12-13, 2013.
55 “Concentration effect of Dy3+ ion on photoluminescence properties in oxy fluro-borate glasses”
K. Venkata Rao, S. Babu, A. Balakrishna and Y.C. Ratnakaram
Oral presentation at “A.P. Science Congress-2013” held at University of Hyderabad,
Hyderabad, during November 14-16, 2013.
56 “Photoluminescence properties of Ho3+ ion in lithium fluoro borate glass containing
different modifier oxides”
A. Balakrishna, D. Rajesh and Y.C. Ratnakaram
Poster presentation at “58th Solid State Physics Symposium” held at Thapar University,
Patiala, Punjab, during December 17-21, 2013.
57 “Photoluminescence Properties of NaPbB5O9:Dy3+ new Material for White Light
Applications”
D. Rajesh and Y.C. Ratnakaram
Poster presentation at “58th Solid State Physics Symposium” held at Thapar University,
Patiala, Punjab, during December 17-21, 2013.
58 “Spectroscopic analysis of different fluorophosphates glasses doped with Sm3+ ions for
reddish-orange laser emission”
S. Babu, A. Balakrishna and Y.C. Ratnakaram
Poster presentation at “58th Solid State Physics Symposium” held at Thapar University,
Patiala, Punjab, during December 17-21, 2013.
59 “PbMoO4:Eu3+ red phosphor material for potential applications in white LEDs”
D. Rajesh, M. Dhamodhara Naidu and Y.C. Ratnakaram
Poster presentation at “National Conference on Advanced Functional Materials
(NCAFM-2014) “held at Dept. of Physics, Bharathiar University, Coimbatore during
January 30-31, 2014.
60 “Investigations on Spectroscopic Properties of Pr3+ and Nd3+ doped Zinc-Aluminium-
Sodium-Phosphate (ZANP) Glasses”
K. Brahmachary, D. Rajesh, S. Babu and Y.C. Ratnakaram
Poster presentation at “National Conference on Advanced Functional Materials
(NCAFM-2014) “held at Dept. of Physics, Bharathiar University, Coimbatore during
January 30-31, 2014.
61 “Optical Characteristics of Eu3+ doped strontium-aluminium-bismuth-borate glasses”
M. Dhamodhara Naidu, D. Rajesh, A. Balakrishna and Y.C. Ratnakaram
Poster presentation at “International conference on advanced functional Materials
(ICAFM-2014)” held at CSIR-NIIST, Thiruvananthapuram, Kerala, during Feb. 19- 21, 2014.
62 “Dy3+ doped oxy-fluoride phosphate glasses for laser materials: A photoluminescence
study”
S. Babu, A. Balakrishna, D. Rajesh and Y.C. Ratnakaram
Poster presentation at “International Conference on Materials and Characterization
Techniques (ICMCT-2014)”, held at VIT University, Vellore, during March 10-12, 2014.
63 “Radiative Properties and energy transfer mechanism of Sm3+ ion in Zinc-Aluminium-
Sodium-Phosphate Glasses”
K. Brahmachary, D. Rajesh, A. Balakrishna and Y.C. Ratnakaram
Oral presentation at “International Conference on Materials and Characterization
Techniques (ICMCT-2014)”, held at VIT University, Vellore, during March 10-12, 2014.
64 “Spectroscopic Properties of Dy3+-doped Zinc-Alumino-Sodium-Phosphate (ZANP)
Glasses”
K. Brahmachary, Y.C. Ratnakaram, D. Rajesh and A. Balakrishna
Poster presentation at “International Conference on Nano Science & Engineering
Applications (ICONSEA-2014)” held at JNTU, Kukatapally, Hyderabad, during June 26-28, 2014.
65 “Optical investigations of Pr3+ doped strontium-aluminium-bismuth-borate glasses”
M. Dhamodhara Naidu, Y.C. Ratnakaram, D. Rajesh and A. Balakrishna
Poster presentation at “International Conference on Nano Science & Engineering
Applications (ICONSEA-2014)” held at JNTU, Kukatapally, Hyderabad, during June 26-28, 2014.
66 “Investigation of emission characteristics of Er3+ doped fluoro-phosphate glasses for
green laser emission”
S. Babu and Y.C. Ratnakaram
Poster presentation at “DAE-BRNS, National Laser Symposium (NLS-23)” held at Department of
Physics, Sri Venkateswara University, Tirupati during Dec.3-6, 2014.
67 “Investigations of the role of different metal oxides on spectroscopic features of Sm3+-activated alkali-
zinc-phosphate glasses
A. Balakrishna, D. Rajesh and Y.C. Ratnakaram
Poster presentation at “DAE-BRNS, National Laser Symposium (NLS-23)” held at Department of
Physics, Sri Venkateswara University, Tirupati during Dec.3-6, 2014.
68 “Study of spectroscopic properties of Sm3+ doped zinc phosphate glasses for reddish-orange
luminescence applications”
V. Reddy Prasad, S. Babu, D. Rajesh and Y.C. Ratnakaram
Poster presentation at “International Seminar on Glasses and other Functional Materials
(ISGFM-2014)” held at Acharya Nagarjuna University, Guntur, during Dec. 11-13, 2014.
69 “Energy transfer based emission analysis of Dy3+/Eu3+ co-doped ZANP glasses for white
LED applications”
K. Brahmachary, D. Rajesh and Y.C. Ratnakaram
Poster presentation at “International Seminar on Glasses and other Functional Materials
(ISGFM-2014)” held at Acharya Nagarjuna University, Guntur, during Dec. 11-13, 2014.
70 “Variation of photoluminescence features of Pr3+ ion in lithium-fluoro-borate glass by changing
different modifier oxides (MgO, CaO, CdO and PbO)-Judd-Ofelt theory application”
A. Balakrishna, D. Rajesh, S. Babu and Y.C. Ratnakaram
Oral presentation at “59th Solid State Physics Symposium” held at VIT University, Vellore, during
Dec.16-20, 2014.
71 “Structural and Luminescence Studies of Ho3+-doped zinc-aluminium-sodium-phosphate
(ZANP) Glasses”
K. Brahmachary, D. Rajesh and Y.C. Ratnakaram
Poster presentation at “59th Solid State Physics Symposium” held at VIT University, Vellore,
during Dec.16-20, 2014.
72 “Optical and luminescence investigations of Dy3+ doped lead free zinc phosphate glasses for
white light applications”
V.Reddy Prasad, S. Babu and Y.C.Ratnakaram
Poster presentation at “International Conference on Science, Technology and applications of
Rare earths (ICSTAR-2015) held at NIIST, Thiruvananthapuram during April 23-25th 2015.
73 “NIR laser emission charactrestics of Er3+ doped fluorophosphates glasses”
S. Babu, V. Reddy Prasad and Y.C. Ratnakaram
Poster presentation at “International Conference on Science, Technology and applications of
Rareearths (ICSTAR-2015) held at Thiruvananthapuram during April 23-25th 2015.
74 “Ho3+ doped fluorophosphate glasses for visible luminescence applications”
S. Babu, V. Reddy Prasad and Y.C. Ratnakaram
Poster presentation at “International Conference on Smart Materials (ICSM-2015) held at Sacred
Heart College, Tirupattur, Vellore during Feb 11-12, 2015.
75. “Luminescence Performance of Eu3+ Doped Lead Free Zinc Phosphate Glasses For Red Emission
V. Reddy Prasad, S. Babu, and Y.C. Ratnakaram
International Conference on Condensed Matter & Applied Physics (ICC-2015), held at Bikaner, Rajasthan, during October 30-31, 2015.
76. “Near Infra-Red Emission Properties of Nd3+ Doped Fluoro-Phosphate Glasses For Photonic Applications”
S. Babu, V. Reddy Prasad and Y.C. Ratnakaram
International Conference on Condensed Matter & Applied Physics (ICC-2015), held at Bikaner, Rajasthan, during October 30-31, 2015.
77. “Luminescence performance of Pr3+ doped multicomponent fluoro-phosphate glasses for solid state lighting technology”
S. Babu and Y.C. Ratnakaram
International Conference on Nanomaterials for Frontier Applications (ICNFA-2015), 2-4 December 2015, Coimbatore Institute of Technology, Coimbatore-641 014, Tamil Nadu.
78. “Luminescent properties of Nd3+ doped fluoro-phosphate glasses at 1.3 m for broadband laser amplification”
S. Babu, V. Reddy Prasad and Y.C. Ratnakaram
International Conference on Nanoscience, Nanotechnology & Advanced Materials (NANOS-2015) held at Gitam University Visakhapatnam, during 14-17 December, 2015.
79. “Emission Characteristics of Holmium Ions in Fluoro-phosphate Glasses for Photonic Applications”
S. Babu and Y.C Ratnakaram
60th DAE Solid State Physics Symposium (DAE-SSPS-2015) held at Amity University UP, Noida, Uttar Pradesh during December 21-25, 2015.
80. “Compositional dependent DSC, FTIR, Raman, Solid state NMR, XPS and XANES properties of Pr3+ doped multicomponent fluoro-phosphate glasses for solid state lighting applications”
S. Babu, V. Reddy Prasad, C. Nayak and Y.C. Ratnakaram
Andhra Pradesh Science Congress (APSC-2015), held at Sri Venkateswara University, Tirupati, during, January 27 – 29, 2016.
81. “Spectroscopic investigation of Nd3+ doped zinc phosphate glasses for the NIR emission at
1.05 μm”
V. Reddy Prasad, S. Dhamodaraiah, S. Babu and Y.C. Ratnakaram
International Conference on Materials Research and Applications (ICMRA-2016), CMR
Technical Campus, Hyderabad, 11-13, March 2016.
82. “Concentration Quenching and Cross-relaxation Channels in Eu3+ Doped Red Emitting Potassium Phosphate Glasses as Optical Materials”
K.Anil Kumar, V. Reddy Prasad, S. Dhamodaraiah, S. Babu and Y.C. Ratnakaram,
2nd Andhra Pradesh Science Congress [APSC-2016], 7-9 Nov, 2016.
83. “Structural, Spectroscopic Properties of Nd3+ Doped Bismuth Phosphate Glasses for Laser Applications”
S. Dhamodaraiah, V.Reddy Prasad, S. Babu and Y.C. Ratnakaram,
Asia Student Photonics Conference, P.B.Siddartha College, Vijayawada, 12-14 Dec, 2016.
84. “Reddish Orange and Red Emitting Light of Sm3+ and Eu3+ Doped Calcium Borophosphate Phosphors Prepared by Solid State Reaction Method”
V.Reddy Prasad, S. Dhamodaraiah, S. Babu and Y.C. Ratnakaram,
Asia Student Photonics Conference, P.B.Siddartha College, Vijayawada, 12-14 Dec, 2016.
85. “Structural, Optical and Photoluminescence Properties: Insights from 31P MAS NMR,
Absorption and Photoluminescence”
S. Dhamodaraiah, V. Reddy Prasad and Y.C. Ratnakaram,
25th DAE-BRNS National Laser Symposium (NLS-25), KIIT University, Bhubaneswar, 20-23 Dec, 2016.
86. “Intense orange laser emission in Pr3+ doped lead free zinc phosphate glasses”
V. Reddy Prasad, S. Damodaraiah and Y.C. Ratnakaram,
25th DAE-BRNS National Laser Symposium (NLS-25), KIIT University, Bhubaneswar, 20-23
Dec, 2016.
87. “Structural, Optical and Luminescence Properties of Dy3+ doped Bismuth Phosphate Glasses: Insights from 31P MAS NMR, Absorption and Photoluminescence”
S. Dhamodaraiah, V. Reddy Prasad and Y.C. Ratnakaram,
61st DAE Solid State Physics Symposium (SSPS-2016), KIIT University, Bhubaneswar, 26-30 Dec. 2016.
88. “NIR Emission at 1.53 μm in Er3+ Doped Lead Free Zinc Phosphate Glasses for Potential
Broadband Optical Amplifiers”
V. Reddy Prasad, S. Damodaraiah and Y.C. Ratnakaram,
61st DAE Solid State Physics Symposium (SSPS-2016), KIIT University, Bhubaneswar, 26-30
Dec. 2016.
89. “Photoluminescence Enhancement through Energy Transfer in Eu3+ and Sm3+/Eu3+ Co-doped
Potassium Fluoro-Phosphate Glasses for Intense Reddish-Orange Lighting Applications”
K.Anil Kumar, V. Reddy Prasad, S. Dhamodaraiah, S. Babu and Y.C. Ratnakaram,
104th Indian Science Congress, S. V. University, Tirupathi, 3-7 Jan, 2017.
90. “Photoluminescence Characteristics of Dy3+ doped Fluorophosphate Glasses for Lasing
Materials”
M.V.Sasi Kumar, S. Babu and Y.C. Ratnakaram,
104th Indian Science Congress, S.V.University, Tirupati, 3-7 Jan, 2017.
91. “Investigation of green luminescence applications of Er3+ doped bismuth phosphate glasses.”
S. Damodaraiah, V. Reddy Prasad, Y.C. Ratnakaram
International conference on recent advances in applied physics (IORAP-2017), Annamalai
University, Chidambaram, 21–22, Sept, 2017.
92. “Investigation of 1.53 μm emission characteristics of Er3+ doped bismuth phosphate glasses
for laser applications.”
S. Damodaraiah, V. Reddy Prasad, Y.C. Ratnakaram
National Laser Symposium (NLS-26), Bhabha Atomic Research Centre (BARC), Mumbai, 20-23, Dec. 2017.
93. “Luminescence studies of Ho3+ doped calcium borophosphate phosphors.”
V. Reddy Prasad, S. Damodaraiah, Y.C. Ratnakaram
International Conference on Advanced Materials (ICAM-2017), St. Joseph College, Thiruchirappali, 14-15, Dec., 2017.
94. “Energy transfer mechanism of Sm3+/Eu3+ co-doped 2CaO-B2O3-P2O5 Phosphors.”
V. Reddy Prasad, S. Damodaraiah, Y.C. Ratnakaram
62nd Solid State Physics Symposium (SSPS-2017), Bhabha Atomic Research Centre (BARC), Mumbai, 26-30, December, 2017.
95. “Nd3+ doped bismuth phosphate glasses for 1.03um solid state laser applications”
S. Damodaraiah and Y.C. Ratnakaram
International Conference on Science, Technology and applications of rare earths (ICSTAR-
2018), Sept. 23-25, 2018, Tirupathi.
96. “Concentration effect on NIR luminescence behavior of Nd3+ doped calcium borophosphate
(CBP) phosphors”
V. Reddy Prasad, S. Damodaraiah, Y.C. Ratnakaram
International Conference on Science, Technology and applications of rare earths (ICSTAR
-2018), Sept. 23-25, 2018, Tirupathi
97. “Luminescence properties of Pr3+ doped calcium borophosphate (CBP) phosphors”
V. Reddy Prasad, S. Damodaraiah, Y.C. Ratnakaram
National Conference on Materials for energy and environment-its development and applications
(NCMFEE-2018) 29-30 April 2018, Osmania University, Hyderabad.
98. “Emission properties of Ho3+ doped different phosphate glasses for 2um laser materials”
B. Harita, V. Reddy Prasad, S. Damodaraiah, Y.C. Ratnakaram
National Conference on Materials for energy and environment-its development and applications
(NCMFEE-2018) 29-30 April 2018, Osmania University, Hyderabad.
99. “Spectroscopic investigations of Er3+ ions doped in different multicomponent phosphate glasses”
B.Harita, V. Reddy Prasad, S. Damodaraiah, Y.C. Ratnakaram
National Conference on Materials for energy and environment-its development and applications
(NCMFEE-2018) 29-30 April 2018, Osmania University, Hyderabad.
100. “Energy transfer studies in Dy3+/Sm3+ co-doped bismuth phosphate glasses for white light applications”
S. Damodaraiah, Y.C. Ratnakaram
National Laser Symposium (NLS-27) 3-6, December 2018, RRCAT, Indore
101. “Influence of Er3+ concentration on NIR luminescence properties in calcium borophosphate
(CBP) phosphors”
V. Reddy Prasad, S. Damodaraiah, Y.C. Ratnakaram
Natioanl Conference on Novel Materials for Device Applications, 4-5 Nov. 2018, Tirupathi.
102. “Absorption and luminescence studies of Sm3+ions activated in distinct phosphate glasses for reddish orange light applications”
C. Nagaraja Naick, V. Reddy Prasad, S. Damodaraiah, A.V.Reddy Y.C. Ratnakaram
Natioanl Conference on Novel Materials for Device Applications, 4-5 Nov. 2018, Tirupathi.
103. “Study of optical and radiative properties of Sm3+ ions in phosphate glasses as an effective
luminescent materials”
K. Venkata Rao, S. Babu Y.C.Ratnakaram
Natioanal Conference on Novel Materials for Device Applications, 4-5 Nov. 2018, Tirupathi.
104. “Structural and photoluminescence decay curve studies of Sm3+- doped LiPbB5O9 phosphor for
reddish-orange emitting light applications”
T. Raghu Raman, V. Reddy Prasad, A.V. Reddy, Y.C. Ratnakaram
64th DAE Solid State Physics Symposium, 18-22 December 2019. IIT Jodhpur, Rajasthan
105. “Concentration dependent Dy3+ activated LiPbB5O9 phosphor – structural and luminescence
studies for white LED applications”
T. Raghu Raman, Y.C. Ratnakaram
28th DAE –BRNS National Laser Symposium (NLS-28) 8-11 January 2020, VIT Chennai.
106. “Fluorescence kinetics of bismuth phosphate glasses for visible and infrared applications: rare
earths as luminescent centres”
S. Damodaraiah and Y.C.Ratnakaram
National Laser Symposium (NLS-28), 8-11 January 2020, VIT, Chennai. (Thesis presentation)
107. “Judd- Ofelt Analysis and luminescence studies on Dy3+- doped different phospahte glasses for white light emitting material applications”
B. Nagaraja Naick , S. Damodaraiah, Y.C. Ratnakaram
2nd National Conference on emerging trends in Materials Science, Govt. Arts College, Tiruvannamlai, Tamilnadu. 26-27 September 2019.
108. “Effect of Li, Mg and Sr on structural and photoluminescence properties of Nd3+ -doped phosphate glasses: Solid state laser applications”
B. Nagaraja Naick, S. Damodaraiah, Y.C. Ratnakaram
National Seminar on Emerging trends and Advances in Multi Functional Materials, Acharya Nagarjuna University, 10-12, December 2019.
UGC Mid-career award
Fellow, A.P.Akademi of Sciences
University best teacher, SVU College of Sciences
List of Ph. D Degrees awarded
1) “Studies in Solid State Physics-Electronic Spectra of Lanthanide glasses” – A. Viswanatha
Reddy – December-2000
2) “Spectroscopic investigations of Certain Lanthanide ions (Sm3+, Dy3+, Ho3+ and Tm3+) doped
mixed alkali borate glasses” – D. Thirupathi Naidu – July-2005
3) “Electronic Spectra of Certain Rare earths doped mixed alkali borate glasses”- A. Vijaya
Kumar – August-2005
4) “Spectral Studies of Nd3+, Ho3+ and Sm3+ doped Lithium Potassium and Sodium
Potassium mixed alkali phosphate glasses” – N.V. Srihari – September-2008
5) “Spectroscopic investigation-EPR and Optical absorption studies of metal ions” – G.N.
Hemanth Kumar – Febrauary-2009
6) “Spectroscopic Investigations on rare earth doped glasses”- K. Venkatrao-January-2011
7) “Characterization and Spectroscopic Investigations on rare earth doped different
Phosphate glasses”- M. Seshadri – May-2011
8) “Influence of mixed alkali on optical absorption and emission spectra of rare earth (Pr3+, Nd3+,
Sm3+, Dy3+ and Ho3+) doped fluoroborate glasses”- C. Venkateswarlu-June-2011
9) “Thermal, optical and photoluminescence properties of lanthanides doped multicomponent
borate glasses” – M.V.Sasi Kumar August 2014.
10) “Concentration effect on spectroscopic properties of different rare earth ions doped strontium
lithium bismuth borate glasses”- D. Rajesh, June 2014.
11) “Absorption and fluorescence features of rare earth ions in lithium fluoroborate glass
-Influence of modifier oxides” – A. Balakrishna, October 2014.
12) “Studies on magnetic, electrical and energy transfer based photoluminescence properties of
certain transition metal and rare earth ions doped PEO+PVP blended polymer films for
electrochemical and display device applications”- K. Naveen Kumar, May 2015.
13) “Optical transitions and luminescence studies of certain rare earth ions in P2O5-Na2HPO4
-ZnO-AlF3-NaF glasses for photonic applications”- K. Brahmachari, May 2015.
14) “Studies on photoluminescence properties of Pr3+, Eu3+ and Ho3+ ions doped borate glasses
and certain phosphors” – M. Damodara Naidu, July 2015.
15) “Certain rare earth doped multicomponent fluoro-phosphate glasses for solid state lighting
applications : A photoluminescence study”- S. Babu, October 2016.
16) “Enhancement and quenching photoluminescence effects of certain rare earths doped
potassium phosphate glasses” – K. Anil Kumar, June 2018.
17) “Spectroscopic investigations on certain rare earths doped different phosphate glasses for
optical applications” – B. Haritha, October 2018.
18) “Studies on the luminescence properties of rare earth doped phosphate glasses and phosphors
for laser and display device application” – V. Reddy Prasad, August 2018.
19) “Fluorescence kinetics of bismuth phosphate glasses for visible and infrared applications :
Rare earths as luminescent centres” – S. Damodaraiah, August 2019.
20) “Application of Judd-Ofelt theory and the evaluation of radiative properties of certain RE3+
doped different phosphate glasses – B. Nagaraja Naik July 2021.
List of M.Phil Degrees awarded
1) “Spectral Studies of rare earth ions Nd3+ and Er3+ in Chloroborate glasses”- N. Sudharani- 1996
2) “Spectroscopic Properties of Certain rare earth ions doped glasses” -Abdul Althaf-2001.
3) “Spectroscopic studies of Pr3+ and Er3+ doped borate glasses” -J. Lakshmi-2004.
4) “Spectroscopic Investigations on Sm3+ and Nd3+ doped glasses”- K. Siresha -2006
5) “Electronic absorption spectra of Sm3+, Nd3+ and Ho3+ doped glasses” -M.V. Sasi Kumar-
2008
6) “Spectroscopic investigations on Nd3+ and Ho3+ doped chlorophosphate glasses” – K. Venkata
Rao- 2008
7) “Spectroscopic investigations of rare earth doped glasses” – P. Srilakshmi – 2013
8) “Optical absorption and emission studies of certain rare earth (Pr3+ and Nd3+) doped glasses” – Anil Kumar – 2015.
9) Spectroscopic and luminescence dynamics of Pr3+ and Er3+ doped zinc phosphate glasses – B. Surya Narayana Devara – 2017
