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
• Publication Date: 2016-10-21T06:25:11Z
• Authors: Le Wang; Rong-Jun Xie; Yuanqiang Li; Xiaojun Wang; Chong-Geng Ma; Dong Luo; Takashi Takeda; Yi-Ting Tsai; Ru-Shi Liu; Naoto Hirosaki
• Keywords: Luminous efficacy; Color rendering index; Luminous flux; Color temperature; Red Color; Solid-State Lighting

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