Ca_(1−x)Li_(x)Al_(1−x)Si_(1+x)N_(3):Eu^(2+) solid solutions as broadband,color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes

Le Wang; Rong-Jun Xie; Yuanqiang Li; Xiaojun Wang; Chong-Geng Ma; Dong Luo; Takashi Takeda; Yi-Ting Tsai; Ru-Shi Liu; Naoto Hirosaki

首页> 中文期刊> 《光：科学与应用（英文版）》 >Ca_(1−x)Li_(x)Al_(1−x)Si_(1+x)N_(3):Eu^(2+) solid solutions as broadband,color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes

Ca_(1−x)Li_(x)Al_(1−x)Si_(1+x)N_(3):Eu^(2+) solid solutions as broadband,color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes

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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 LiSi_(2)N_(3) into CaAlSiN_(3):Eu^(2+).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℃),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(101 lm W^(−1)),validating its superiority in highperformance solid state lightings over currently used red phosphors.

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《光：科学与应用（英文版）》 |2016年第1期|465-473|共9页
作者
Le Wang; Rong-Jun Xie; Yuanqiang Li; Xiaojun Wang; Chong-Geng Ma; Dong Luo; Takashi Takeda; Yi-Ting Tsai; Ru-Shi Liu; Naoto Hirosaki;
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作者单位

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;

Department of Chemistry;

Taiwan University;

Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology;

Taipei University of Technology;

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原文格式 PDF
正文语种 chi
中图分类无机化学;
关键词
color rendering; LEDs; nitride; phosphor; structure disorder;

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Ca_(1−x)Li_(x)Al_(1−x)Si_(1+x)N_(3):Eu^(2+) solid solutions as broadband,color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes

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