Room-temperature synthesis, controllable morphology and optical characteristics of narrow-band red phosphor K2LiGaF6:Mn4+

被引：19

作者：

Cheng, Haiming ^{[1
]}

Song, Yan ^{[1
]}

Hong, Feng ^{[1
]}

Liu, Guixia ^{[1
]}

Li, Dan ^{[1
]}

Ma, Qianli ^{[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

来源：

CRYSTENGCOMM | 2018年 / 20卷 / 15期

关键词：

WHITE LED APPLICATIONS; EMITTING PHOSPHOR; HIGHLY EFFICIENT; COLOR CONVERTER; LUMINESCENCE PROPERTIES; MN4+; PHOTOLUMINESCENCE; LIGHT;

D O I：

10.1039/c8ce00197a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A series of red phosphors based on the substitution of Mn4+ for Ga3+ in the lattice of K2LiGaF6 were synthesized via a co-precipitation method. Their structure, morphology and composition were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDS) in detail. The luminescence properties of the K2LiGaF6:Mn4+ samples were systematically evaluated by photoluminescence (PL) spectroscopy. The excitation spectrum consists of two broad bands from 300 to 550 nm. The obtained K2LiGaF6:Mn4+ can exhibit red light peaking at 636 nm for the E-2(g) -> (4)A(2g) transition of Mn4+ ions under 470 nm excitation. A low concentration quenching phenomenon occurs in K2LiGaF6:Mn4+ and the optimal doping concentration is about 4%. The critical distance was calculated to be 9.107 angstrom. The changes of the emission intensity and morphology of K2LiGaF6:Mn4+ based on different lithium sources and surfactants were investigated in detail. White light-emitting diodes (WLEDs) fabricated from the red K2LiGaF6:Mn4+ phosphor exhibit good performance with a colour rendering index of 79.6, a low colour temperature of 4378 K and a luminous efficiency of 109.91 lm W-1. Therefore, the K2LiGaF6:Mn4+ red phosphors can be used as good candidates for WLEDs.

引用

页码：2183 / 2192

页数：10

共 41 条

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