期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 33, 页码 9652-9656出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201604427
关键词
charge transfer; coatings; light-emitting diodes; luminescence; phosphors
资金
- Ministry of Science and Technology of Taiwan [MOST 104-2113-M-002-012-MY3, MOST 104-2119-M-002-027-MY3, MOST 104-2923-M-002-007-MY3]
- Mitsubishi Chemical Group, Science and Technology Research Center Inc., Japan
- National Center for Research and Development Poland [PL-TW2/8/2015]
- Ministry of Science and Higher Education of Poland [0271/ IP3/2015/73]
A SrLiAl3N4:Eu2+ (SLA) red phosphor prepared through a high-pressure solid-state reaction was coated with an organosilica layer with a thickness of 400-600 nm to improve its water resistance. The observed 4f(6)5d -> 4f(7) transition bands are thought to result from the existence of Eu2+ at two different Sr2+ sites. Luminescence spectra at 10K revealed two zero-phonon lines at 15377 (for Eu(Sr1)) and 15780 cm(-1) (for Eu(Sr2)). The phosphor exhibited stable red emission under high pressure up to 312 kbar. The configurational coordinate diagram gave a theoretical explanation for the Eu2+/3+ result. The coated samples showed excellent moisture resistance while retaining an external quantum efficiency (EQE) of 70% of their initial EQE after aging for 5 days under harsh conditions. White-light-emitting diodes of the SLA red phosphor and a commercial Y3Al5O12:Ce3+ yellow phosphor on a blue InGaN chip showed high color rendition (CRI=89, R9=69) and a low correlated color temperature of 2406 K.
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