Pardha Saradhi, M. ; Lakshminarasimhan, N. ; Boudin, S. ; Vijay Kumar Gupta, K. ; Varadaraju, U.V. ; Raveau, B. (2014) Enhanced luminescence of Sr2SiO4:Dy3+ by sensitization (Ce3+/Eu2+) and fabrication of white light-emitting-diodes Materials Letters, 117 . pp. 302-304. ISSN 0167-577X
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Official URL: http://doi.org/10.1016/j.matlet.2013.12.020
Related URL: http://dx.doi.org/10.1016/j.matlet.2013.12.020
Abstract
The role of sensitization by co-doping Ce3+/Eu2+ in the Sr2SiO4:Dy3+ phosphor system is studied with a view of improving the emission properties and chromaticity coordinates. The concentration dependence of the emission intensity of Dy3+ in Sr2−2xDyxLixSiO4: (x=0.01–0.05 in steps of 0.01) is studied, and the critical concentration is found to be 3 mol% Dy3+ per formula unit. Partial energy transfer from Ce3+ to Dy3+ is observed, and the luminescence intensity of Dy3+ is enhanced. It is also found that Eu2+, Ce3+ containing compositions show better white emission than the corresponding Sr2SiO4:Dy3+. LEDs fabricated by coating the ultraviolet (UV) emitting chips with the synthesized phosphor compositions show bright white emission with reasonable chromaticity coordinates.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Materials Research Society. |
| ID Code: | 131546 |
| Deposited On: | 07 Dec 2022 05:24 |
| Last Modified: | 07 Dec 2022 05:24 |
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