Hydrothermal synthesis of narrow-band red emitting K2NaAlF6: Mn4+ phosphor for warm-white LED applications

被引:34
作者
Cheng, Haiming [1 ]
Song, Yan [1 ]
Liu, Guixia [1 ]
Li, Dan [1 ]
Dong, Xiangting [1 ]
Wang, Jinxian [1 ]
Yu, Wensheng [1 ]
机构
[1] Changchun Univ Sci & Technol, Key Lab Appl Chem & Nanotechnol Univ Jilin Prov, Changchun, Jilin, Peoples R China
关键词
PHOTOLUMINESCENCE PROPERTIES; LUMINESCENCE PROPERTIES; HIGHLY EFFICIENT; COLOR CONVERTER; K2SIF6MN4+ PHOSPHOR; CRYSTAL-STRUCTURE; W-LEDS; LIGHT; DIODES; IONS;
D O I
10.1039/c7ra09671b
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A series of Mn4+ activated aluminofluoride (K2NaAlF6) red phosphors were synthesized via a hydrothermal route. The structure, morphology and composition were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDX). The photoluminescence properties were investigated by using emission and excitation spectra, temperature dependent luminescence spectra and decay curves. The obtained K2NaAlF6: Mn4+ can emit red light peaking at 633 nm under 460 nm excitation. The critical quenching concentration of Mn4+ was about 1%. The changes in Mn4+ emissions based on different ratios of KF to NaF, reaction temperature and reaction time were investigated in detail. Concentration and thermal quenching mechanisms were elucidated systematically. The white light-emitting diodes (WLED) fabricated with the as-prepared phosphor exhibit a low color temperature (4310 K), higher color rendering index (R-a = 78.7) and luminous efficacy of 60.22 lm W-1. The inherent advantage of K2NaAlF6: Mn4+ makes it a promising red phosphor for future WLED.
引用
收藏
页码:45834 / 45842
页数:9
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