Ca1-x Li x Al1-x Si1+x N3 :Eu2+ solid solutions as broadband, color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes

Light, Science & Applications
Le WangNaoto Hirosaki

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 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 (101 lm W-1), validating its superiority in high-performance solid state lightings over currently used red phosphors.

References

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Citations

Nov 15, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Dashuai SunJiahua Zhang
Apr 18, 2019·Light, Science & Applications·Ming ZhaoZhiguo Xia
Feb 25, 2018·Chemistry : a European Journal·Jonas Häusler, Wolfgang Schnick
Dec 8, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Dashuai SunJiahua Zhang
Jan 12, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Liang ZhangHongpeng You
Jul 15, 2021·Advanced Science·Hailong YuanRomain Gautier
Aug 3, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Jiao WuQingguang Zeng
Apr 13, 2018·The Journal of Physical Chemistry. a·Bibo LouChang-Kui Duan
May 16, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Congxin XiaXia Xin
May 24, 2019·ACS Applied Materials & Interfaces·Yongfu LiuHaochuan Jiang

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Methods Mentioned

BETA
X-ray
nuclear magnetic resonance
NMR

Software Mentioned

GSAS
VASP
Vienna Ab initio simulation package ( VASP )

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