Ca1−<italic style="font-style: italic">x</italic>Li<italic style="font-style: italic">x</italic>Al1−<italic style="font-style: italic">x</italic>Si1+<italic style="font-style: italic">x</italic>N3: Eu2+ 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

doi:10.1038/lsa.2016.155

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Ca₁_−xLi_xAl₁₋_xSi_1+xN₃: Eu²⁺ solid solutions as broadband, color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes

Original Articles

- Ca₁_−xLi_xAl₁₋_xSi_1+xN₃: Eu²⁺ solid solutions as broadband, color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes
- Light: Science & Applications Vol. 5, Issue 4, (2016)
- Affiliations：
  
  1.College of Optics and Electronic Science and Technology, China Jiliang University, Hangzhou, Zhejiang 310018, China
  2.College of Materials, Xiamen University, Xiamen, Fujian 361005, China
  3.Sialon Group, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
  4.Intematix Corporation, Fremont, CA 94538, USA
  5.College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
  6.Department of Chemistry, Taiwan University
  7.Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, Taipei University of Technology
- Author bio：
  
  L Wang, Email: calla@cjlu.edu.cn
  RJ Xie, Email: rjxie@xmu.edu.cn
- Funds：
- DOI：10.1038/lsa.2016.155
  CLC：
- Published：2016-12，
  
  Published Online：15 April 2016，
  
  Received：26 February 2016，
  
  Revised：07 April 2016，
  
  Accepted：11 April 2016
- Accepted：
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Wang, L. et al. Ca₁_−xLi_xAl₁₋_xSi_1+xN₃: Eu²⁺ solid solutions as broadband, color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes. Light: Science & Applications, 5, e16155 (2016).
DOI：

Wang, L. et al. Ca₁_−xLi_xAl₁₋_xSi_1+xN₃: Eu²⁺ solid solutions as broadband, color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes. Light: Science & Applications, 5, e16155 (2016). DOI： 10.1038/lsa.2016.155.

摘要

Abstract

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

into CaAlSiN

: Eu

. 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 high-performance solid state lightings over currently used red phosphors.

关键词

Keywords

color renderingLEDsnitridephosphorstructure disorder

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⁰

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

DOI：10.1038/lsa.2016.155

摘要

Abstract

关键词

Keywords

references

Ca₁_−xLi_xAl₁₋_xSi_1+xN₃: Eu²⁺ solid solutions as broadband, color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes