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

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Room-temperature synthesis, controllable morphology and optical characteristics of narrow-band red phosphor K2LiGaF6:Mn4+
CrystEngComm ( IF 2.6 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1039/c8ce00197a
Haiming Cheng _{1,

2,

3,

4} , Yan Song _{1,

2,

3,

4} , Feng Hong _{1,

2,

3,

4} , Guixia Liu _{1,

2,

3,

4} , Dan Li _{1,

2,

3,

4} , Qianli Ma _{1,

2,

3,

4} , Xiangting Dong _{1,

2,

3,

4} , Jinxian Wang _{1,

2,

3,

4} , Wensheng Yu _{1,

2,

3,

4}

Affiliation

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 ²E_g → ⁴A_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 Å. 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.

中文翻译：

窄带红色荧光粉K ₂ LiGaF ₆：Mn ⁴⁺的室温合成，可控形态和光学特性

通过共沉淀法合成了一系列基于K ₂ LiGaF ₆晶格中Mn ⁴⁺取代Ga ³⁺的红色荧光粉。通过X射线衍射（XRD），扫描电子显微镜（SEM）和能量色散X射线光谱法（EDS）对它们的结构，形态和组成进行了表征。K ₂ LiGaF ₆：Mn ⁴⁺样品的发光特性通过光致发光（PL）光谱系统地评估。激发光谱由两个从300到550 nm的宽带组成。所得的K ₂ LiGaF ₆：Mn ⁴⁺在470 nm激发下，Mn ⁴⁺离子的² E _g → ⁴ A _2g跃迁可以在636 nm处出现峰值的红光。在K ₂ LiGaF ₆：Mn ^4+中发生低浓度淬灭现象，并且最佳掺杂浓度为约4％。临界距离经计算为9.107Å。详细研究了不同锂源和表面活性剂对K ₂ LiGaF ₆：Mn ⁴⁺发光强度和形貌的影响。由红色K ₂ LiGaF ₆：Mn制成的白色发光二极管（WLED）⁴⁺荧光粉表现出良好的性能，显色指数为79.6，色温为4378 K，发光效率为109.91 lm W^-1。因此，K₂ LiGaF₆：Mn⁴⁺红色磷光体可以用作WLED的良好候选材料。

更新日期：2018-03-12

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