Phase-transition-induced giant enhancement of red emission in Mn4+-doped fluoride elpasolite phosphors†,Journal of Materials Chemistry C

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Phase-transition-induced giant enhancement of red emission in Mn4+-doped fluoride elpasolite phosphors†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-03-07 00:00:00 , DOI: 10.1039/c8tc00739j
Yiwen Zhu _{1,

2,

3,

4} , Daqin Chen _{1,

2,

3,

4,

5} , Lin Huang _{4,

6,

7,

8,

9} , Yong Liu _{4,

6,

7,

8,

9} , Mikhail G. Brik _{4,

10,

11,

12,

13} , Jiasong Zhong _{1,

2,

3,

4} , Jing Wang _{4,

6,

7,

8,

9}

Affiliation

Mn⁴⁺-Doped red fluoride phosphors have attracted significant interest of researchers because of their excellent luminescence properties that can address the issue of the lack of red light components in commercial white light-emitting-diodes (WLEDs). Herein, we synthesized two novel Mn⁴⁺-based phosphors based on two different K₂LiAlF₆ phases (cubic and trigonal). The quantum efficiency of cubic K₂LiAlF₆:Mn⁴⁺ was only 3.2%, but it underwent a dramatic increase to 87.5% when the trigonal phase changed to cubic K₂LiAlF₆. The trigonal phase was gradually transformed to the cubic phase by controlling the HF volume concentration; this led to an increase in the Mn content and enhancement of the emission intensity. The analysis of the experimental spectra of the synthesized phosphors was facilitated by the crystal field calculations of the K₂LiAlF₆:Mn⁴⁺ energy levels. A good agreement between the theoretical and experimental data was achieved. Special attention was paid to the structure of these two phases and the phase transition mechanism. The morphologies, compositions, and temperature-dependent photoluminescence properties were investigated in detail. The as-prepared phosphors showed excellent thermal and chromatic stabilities. Finally, the optimized K₂LiAlF₆:Mn⁴⁺ phosphor was blended with the YAG:Ce³⁺ yellow phosphor and a blue LED to fabricate WLEDs. The color rendering index (Ra) of this new WLED is 86, and the correlated color temperature (CCT) is 3498 K. These findings indicate that the K₂LiAlF₆:Mn⁴⁺ phosphor is a promising red phosphor for applications in WLEDs.

中文翻译：

相变诱导Mn ⁴⁺掺杂的氟钙钛矿磷光体中红色发射的巨大增强†

Mn ⁴⁺掺杂的红色氟化物磷光体因其出色的发光特性而引起了研究人员的极大兴趣，这些特性可以解决商业白色发光二极管（WLED）中缺少红色光成分的问题。在本文中，我们基于两种不同的K ₂ LiAlF ₆相（立方相和三角相）合成了两种新型的Mn ⁴⁺基荧光粉。立方K ₂ LiAlF ₆：Mn ⁴⁺的量子效率仅为3.2％，但是当三角相变为立方K ₂ LiAlF ₆时，量子效率显着提高至87.5％。。通过控制HF的体积浓度，将三角相逐渐转变为立方相。这导致锰含量的增加和发射强度的增加。通过K ₂ LiAlF ₆：Mn ⁴⁺能级的晶体场计算，可以方便地对合成磷光体的实验光谱进行分析。理论和实验数据之间取得了很好的一致性。特别注意了这两个阶段的结构和相变机制。详细研究了形貌，组成和与温度有关的光致发光特性。所制备的磷光体显示出优异的热稳定性和色稳定性。最后，优化的K ₂将LiAlF ₆：Mn ⁴⁺荧光粉与YAG：Ce ³⁺黄色荧光粉和蓝色LED混合以制造WLED。这种新型WLED的显色指数（Ra）为86，相关色温（CCT）为3498K。这些发现表明，K ₂ LiAlF ₆：Mn ⁴⁺荧光粉是一种有希望用于WLED的红色荧光粉。

更新日期：2018-03-07

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