Luminescent properties and applications of K2TiF6:Mn4+ red-emitting crystals

JIANG Qiongfang; YANG Qilin; LI Xianggui; HU Xuemei; ZHOU Qiang; WANG Zhengliang

doi:10.37188/CJL.20230224

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Luminescent properties and applications of K₂TiF₆:Mn⁴⁺ red-emitting crystals

更新时间：2023-10-23

- Luminescent properties and applications of K₂TiF₆:Mn⁴⁺ red-emitting crystals
  增强出版
- Chinese Journal of Luminescence Pages: 1-8(2023)
- 作者机构：
  
  1.云南民族大学化学与环境学院云南省高校绿色化学材料重点实验室，云南昆明　650500
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(22165033);Key Projects of Yunnan Basic Research Program(202301AS070002)
- DOI：10.37188/CJL.20230224
  CLC：
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蒋琼芳,杨奇林,李香归等.K₂TiF₆:Mn⁴⁺红光晶体发光性能及应用研究[J].发光学报,

JIANG Qiongfang,YANG Qilin,LI Xianggui,et al.Luminescent properties and applications of K₂TiF₆:Mn⁴⁺ red-emitting crystals[J].Chinese Journal of Luminescence,
蒋琼芳,杨奇林,李香归等.K₂TiF₆:Mn⁴⁺红光晶体发光性能及应用研究[J].发光学报, DOI：10.37188/CJL.20230224

JIANG Qiongfang,YANG Qilin,LI Xianggui,et al.Luminescent properties and applications of K₂TiF₆:Mn⁴⁺ red-emitting crystals[J].Chinese Journal of Luminescence, DOI：10.37188/CJL.20230224

摘要

本文采用溶剂挥发法，在室温条件下生长出掺不同浓度Mn,4+,的K,2,TiF,6,：Mn,4+,红光晶体。样品在紫光区和蓝光区都表现出Mn,4+,的特征宽带激发，这对应于其,4,A,2, → ,4,T,1,和,4,A,2, → ,4,T,2,能级跃迁。在蓝光激发下，所有晶体都呈现出一系列窄带红光发射，其中最强发射峰位于631 nm处。在这些晶体中，样品K,2,TiF,6,：Mn,4+ ,（13.18 mol%）表现出最高效的红光发射，其内外量子效率分别高达97.2%和83.3%。值得一提的是，此样品表现出荧光负热猝灭效应，其在120°C时的红光发射强度是室温时的1.81倍。所得晶体与Y,3,Al,5,O,12,：Ce,3+, （YAG：Ce,3+,）所组装的暖白光LED流明效率（LE）高达180.9 lm/W、色温低至3859 K、显色指数为91.3。与β-SiAlON：Eu,2+,组装成白光LED器件LE也达101.5 lm/W，显示色域为NTSC （National Television System Committee）标准值的94%。因此K,2,TiF,6,：Mn,4+,晶体在白光LED照明及显示领域具有潜在应用前景。

Abstract

Herein， K,2,TiF,6,：Mn,4+ ,red-emitting crystals doped with different amounts of Mn,4+, 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 ,4,A,2, → ,4,T,1 ,and ,4,A,2, → ,4,T,2 ,transitions,of Mn,4+,. Meanwhile， they present a series of narrow-band red emissions with the strongest emission peak at 631 nm. Among these samples， the K,2,TiF,6,：Mn,4+ ,（13.18 mol%） 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 K,2,TiF,6,：Mn,4+ ,（13.18 mol%） crystals show an obvious negative thermal effect. The emission intensity at 120°C is 1.81 times higher than the initial value. The warm white LED based on K,2,TiF,6,：Mn,4+ ,（13.18 mol%） crystals and the commercial YAG：Ce,3+, yellow phosphor shows excellent performance with a high luminous efficiency （LE） of 180.9 lm/W， a low correlated color temperature （3859 K） and an ideal color rendering index （91.3） The white LED based on β-SiAlON：Eu,2+, 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， K,2,TiF,6,：Mn,4+ ,red-emitting crystals exhibit potential application in white LEDs.

关键词

红光晶体氟化物发光性能白光LED

Keywords

Red-emitting crystalsfluoridesluminescent propertieswhite LEDs

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