Luminescent Properties and Applications of K2TiF6∶Mn4+ Red-emitting Crystals

被引：0

作者：

Jiang Q. ^{[1
]}

Yang Q. ^{[1
]}

Li X. ^{[1
]}

Hu X. ^{[1
]}

Zhou Q. ^{[1
]}

Wang Z. ^{[1
]}

机构：

[1] Key Laboratory of Green-chemistry Materials in University of Yunnan Province, School of Chemistry & Environment, Yunnan Minzu University, Kunming

来源：

Faguang Xuebao/Chinese Journal of Luminescence | 2023年 / 44卷 / 12期

基金：

中国国家自然科学基金;

关键词：

fluorides; luminescent properties; red-emitting crystals; white LEDs;

D O I：

10.37188/CJL.20230224

中图分类号：

学科分类号：

摘要：

Herein，K2TiF6∶Mn4+ red-emitting crystals doped with different amounts of Mn4+ were successfully grown by vaporing the solvent at room temperature. These crystals exhibit two broad excitation bands in the UV and blue light regions，which are due to 4A2 → 4T1 and 4A2 → 4T2 transitions of Mn4+. Meanwhile，they present a series of narrow-band red emissions with the strongest emission peak at 631 nm. Among these samples，the K2TiF6∶Mn4+ （13. 18%）sample exhibits the strongest emission intensity with a high internal quantum efficiency of 97. 2% and a high external quantum efficiency of 83. 3%. It is worth noting that K2TiF6∶Mn4+（13. 18%）crystals show an obvious negative thermal effect. The emission intensity at 120 ℃ is 1. 81 times higher than the initial value. The warm white LED based on K2TiF6∶Mn4+（13. 18%）crystals and the commercial YAG∶Ce3+ yellow phosphor shows excellent performance with a high luminous efficiency（LE）of 180. 9 lm/W，a low correlated color temperature（3 859 K）and an ideal color rendering index（91. 3）. The white LED based on β-SiAlON∶Eu2+ also has a LE of 101. 5 lm/W，and its color gamut is up to 94% of NTSC（National Television System Committee）standard value. Hence，K2TiF6∶Mn4+ red-emitting crystals exhibit potential application in white LEDs. © 2023 Chines Academy of Sciences. All rights reserved.

引用

页码：2180 / 2187

页数：7

共 26 条

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