Efficiency and Thermal Stability Enhancements of Sr2SiO4:Eu2+ Phosphor via Bi3+ Codoping for Solid-State White Lighting
- Authors
- Park, Seung Hyok; Yoon, Ho Shin; Boo, Hye Min; Jang, Ho Gyeom; Lee, Kyoung Hwa; Im, Won Bin
- Issue Date
- 2월-2012
- Publisher
- IOP PUBLISHING LTD
- Keywords
- Edge-sharing tetrahedra; Enitting diodes; Yellow phosphor
- Citation
- JAPANESE JOURNAL OF APPLIED PHYSICS, v.51, no.2
- Indexed
- SCIE
SCOPUS
- Journal Title
- JAPANESE JOURNAL OF APPLIED PHYSICS
- Volume
- 51
- Number
- 2
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/106154
- DOI
- 10.1143/JJAP.51.022602
- ISSN
- 0021-4922
- Abstract
- Bi and Eu-codoped yellow-emitting phosphors of composition Sr1.95-xEu0.05BixSiO4 were prepared, and their emission and thermal quenching characteristics were investigated. The initial PL intensity and thermal quenching behaviors of Sr1.95-xEu0.05BixSiO4 were affected by the Bi-codoping as a coactivator. When 0.01 mol% of Bi was codoped to Sr1.95-xEu0.05BixSiO4, it showed an intense emission peak at 543nm under 450nm excitation. The peak intensity corresponds to a relative intensity of 112% of a commercial Sr2SiO4:Eu2+ phosphor (Force4 Corp.), which may be attributed to energy transfer between Bi3+ and Eu2+. The results suggest that phosphors deriving from Sr1.95-xEu0.05BixSiO4 will be a breakthrough for white light emitting diode (LEDs) and related applications in terms of efficiency enhancement and thermal stability. (C) 2012 The Japan Society of Applied Physics
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