首页|Ca1-xLixAl1-xSi1+xN3:Eu2+ solid solutions as broadband, color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes

Ca1-xLixAl1-xSi1+xN3:Eu2+ solid solutions as broadband, color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes

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  • 国家科技期刊平台
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Color rendition,luminous efficacy and reliability are three key technical parameters for white light-emitting diodes (wLEDs) that are dominantly determined by down-conversion phosphors.However,there is usually an inevitable trade-off between color rendition and luminescence efficacy because the spectrum of red phosphor (that is,spectral broadness and position) cannot satisfy them simultaneously.In this work,we report a very promising red phosphor that can minimize the aforementioned trade-off via structure and band-gap engineering,achieved by introducing isostructural LiSi2N3 into CaAlSiN3:Eu2+.The solid solution phosphors show both substantial spectra broadening (88 → 117 nm) and blueshift (652→ 642 nm),along with a significant improvement in thermal quenching (only a 6％ reduction at 150 ℃C),which are strongly associated with electronic and crystal structure evolutions.The broadband and robust red phosphor thus enables fabrication of super-high color rendering wLEDs (Ra =95 and R9=96) concurrently with the maintenance of a high-luminous efficacy (101ImW-1),validating its superiority in highperformance solid state lightings over currently used red phosphors.

color renderingLEDsnitridephosphorstructure disorder

Le Wang、Rong-Jun Xie、Yuanqiang Li、Xiaojun Wang、Chong-Geng Ma、Dong Luo、Takashi Takeda

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College of Optics and Electronic Science and Technology, China Jiliang University, Hangzhou, Zhejiang 310018, China

College of Materials, Xiamen University, Xiamen, Fujian 361005, China

Sialon Group, National Institute for Materials Science(NIMS), Tsukuba, Ibaraki 305-0044, Japan

Intematix Corporation, Fremont, CA 94538, USA

College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

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We are grateful for the financial support from the JSPS KAKENHINational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Zhejiang ProvinceTaiwan Science and Technology AuthorityTaiwan Science and Technology Authority

235608115127225961575182515722351561135015Y16F050012‘MOST’ 104-2113-M-002-012-MY3104-2119-M-002-027-MY3

2016

10.1038/lsa.2016.155

光:科学与应用(英文版)
中国科学院长春光学精密机械与物理研究所

光:科学与应用(英文版)

CSTPCDCSCDSCI
ISSN：2095-5545
年,卷(期)：2016.5(4)
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