Moisture-Resistant Mn4+-Doped Core-Shell-Structured Fluoride Red Phosphor Exhibiting High Luminous Efficacy for Warm White Light-Emitting Diodes

被引：166

作者：

Huang, Decai ^{[1
,2
,3
,4
]}

Zhu, Haomiao ^{[1
,2
,3
]}

Deng, Zhonghua ^{[1
,2
]}

Zou, Qilin ^{[1
,2
]}

Lu, Hongyu ^{[1
,2
]}

Yi, Xiaodong ^{[1
,2
]}

Guo, Wang ^{[1
,2
]}

Lu, Canzhong ^{[1
,2
,3
,4
]}

Chen, Xueyuan ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, CAS Key Lab Design & Assembly Funct Nanostruct, Fujian Inst Res Struct Matter, Fuzhou 350002, Fujian, Peoples R China

[2] Chinese Acad Sci, Fujian Key Lab Nanomat, Fujian Inst Res Struct Matter, Fuzhou 350002, Fujian, Peoples R China

[3] Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen 361021, Fujian, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2019年 / 58卷 / 12期

关键词：

cation exchange; luminous efficacy; Mn4+; phosphors; photoluminescence; EFFICIENT; ROUTE; NANOCRYSTALS; K2SIF6MN4+;

D O I：

10.1002/anie.201813363

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

K2TiF6:Mn4+ is a highly efficient narrow-band emission red phosphor with promising applications in white light-emitting diodes (LEDs) and wide-gamut displays. Nevertheless, the poor moisture-resistant properties of this material hinder commercialization. A convenient reverse cation-exchange strategy is introduced for constructing a core-shellstructured K2TiF6:Mn4+@K2TiF6 phosphor. The outer K2TiF6 shell acts as a shield for preventing moisture in the air from hydrolyzing the internal MnF62- group, while effectively cutting off the path of energy migration to surface defects, thereby increasing the emission efficiency (especially for the phosphors doped with high concentrations of Mn4+). Employed as a red phosphor, the packaged white LED exhibits an extraordinarily high luminous efficacy of 162 lm W-1, a correlated color temperature (CCT) of 3510 K, and a color rendering index of 93 (R-a). Aging tests performed on this device at 85 degrees C and 85 % humidity for 480 h retain up to 89% luminous efficacy. The findings could facilitate commercial application of K2TiF6:Mn4+@K(2)TiF(6 )phosphor.

引用

页码：3843 / 3847

页数：5

共 45 条

[31] Highly Efficient and Stable Narrow-Band Red Phosphor Cs2SiF6:Mn4+ for High-Power Warm White LED Applications [J].