Vij, Ankush Kumar, Shalendra Won, S. O. Chae, K. H. Dubey, Abhinav Kumar, Ravi 2024-01-19T22:00:24Z 2024-01-19T22:00:24Z 2021-09-03 2018-09-15 0167-577X https://pubs.kist.re.kr/handle/201004/120911 The quest of improving luminescence efficiency in alkaline earth sulfide phosphors has been of great interest due to their applications in diverse areas. We synthesized SrS:Ce-0.05, Sr0.75Ba0.20S:Ce-0.05, Sr0.75Ca0.20S:Ce-0.05 and Sr0.75Ca0.10Ba0.10S:Ce-0.05 phosphors using solid state diffusion method. X-ray diffraction patterns of all the samples were found similar to the cubic SrS phase except minor shifts in angles. To ascertain the valence state of Ce, near edge X-ray absorption fine structure spectroscopy was employed using synchrotron radiations. We simulated Ce M-5,M-4-edges of Ce3+ ions using atomic multiplet calculations, which agrees well with the experimental data, clearly suggesting that Ce enters as Ce3+ in all the samples. The photoluminescence spectra of synthesized phosphors exhibit blue-green emission assigned to the 5d-4f transitions in Ce3+ levels, with minor shifts in wavelength. Interestingly, Ca2+/Ba2+ substitution in SrS: Ce phosphors increases the PL intensity considerably. In comparison to SrS: Ce-0.05, PL intensity of Sr0.75Ca0.10Ba0.10S:Ce-0.05 phosphors was enhanced by 2.7 times, which may be exploited in many optical applications. (C) 2018 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV BI Enhanced photoluminescence response of Ca2+/Ba2+ substituted solid solutions of SrS: Ce phosphors Article 10.1016/j.matlet.2018.05.071 1 MATERIALS LETTERS, v.227, pp.169 - 171 MATERIALS LETTERS 227 169 171 scie scopus 000436420200044 2-s2.0-85047142848 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article BI Phosphors Solid solutions Photoluminescence NEXAFS