Cold Sintering of Highly Transparent Calcium Fluoride Nanoceramic as a Universal Platform for High-Power Lighting

被引：43

作者：

Gao, Jie ^{[1
]}

Xia, Zhiguo ^{[2
]}

Ding, Qi ^{[1
]}

Liu, Yongping ^{[1
]}

Yan, Peng ^{[1
]}

Hu, Yunfeng ^{[1
]}

Wang, Lianjun ^{[1
]}

Luo, Wei ^{[1
]}

Fan, Yuchi ^{[1
]}

Jiang, Wan ^{[1
]}

机构：

[1] Donghua Univ, Inst Funct Mat, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China

[2] South China Univ Technol, Guangdong Engn Technol Res & Dev Ctr Special Opt F, State Key Lab Luminescent Mat & Devices, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tech, Guangzhou 510641, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2023年 / 33卷 / 33期

关键词：

cold sintering; high-power lighting; nanoceramics; transparent; GENERATION; CONVERTER; GLASS; SILICA;

D O I：

10.1002/adfm.202302088

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A thermally robust all-inorganic color converter is imperative to high-power light-emitting diode (LED) lighting. However, it remains challenging to find a universal inorganic matrix for encapsulating multicolor phosphors due to the hurdle of achieving a highly transparent medium at a moderate temperature. Here, the densification of calcium fluoride (CaF2) nanoceramic with visible transmittance up to 75% at merely 350 degrees C, benefiting from an acid-mediated cold sintering process of oxygen-segregated CaF2 nanoparticles is reported. Using the optically isotropic CaF2 as a transparent platform, a Y3Al5O12:Ce3+ (YAG: Ce) phosphor-based phosphor-in-ceramics (PiC) converter with luminous efficacy as high as 190 lm W-1 is fabricated. The ultralow temperature enables the PiC converter to be further combined with red-emitting CaAlSiN3:Eu2+ (CASN:Eu), delivering a color-rendering index of 92. The cold-sintered CaF2 nanoceramic demonstrates great potential as a general solution for next-generation high-power LED lighting.

引用

页数：8

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