期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 12, 页码 3843-3847出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201813363
关键词
cation exchange; luminous efficacy; Mn4+; phosphors; photoluminescence
资金
- Strategic Priority Research Program of the CAS [XDB20000000]
- NSFC [U1805252]
- CAS/SAFEA International Partnership Program for Creative Research Teams
- Natural Science Foundation of Fujian Province [2017I0018]
- Youth Innovation Promotion Association of the CAS [2015241]
- Chunmiao Project of Haixi Institutes of the CAS [CMZX-2015-002]
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.
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