发光学报2023，Vol.44Issue(12)：2180-2187,8.DOI:10.37188/CJL.20230224
K2TiF6:Mn4+红光晶体发光性能及应用
Luminescent Properties and Applications of K2TiF6:Mn4+ Red-emitting Crystals
摘要
Abstract
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 nar-row-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 per-formance 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.关键词
红光晶体/氟化物/发光性能/白光LEDKey words
red-emitting crystals/fluorides/luminescent properties/white LEDs分类
数理科学引用本文复制引用
蒋琼芳,杨奇林,李香归,胡雪梅,周强,汪正良..K2TiF6:Mn4+红光晶体发光性能及应用[J].发光学报,2023,44(12):2180-2187,8.基金项目
国家自然科学基金(22165033) （22165033）
云南省基础研究计划重点项目(202301AS070002)Supported by National Natural Science Foundation of China(22165033) （202301AS070002）
Key Projects of Yunnan Basic Research Program(202301AS070002) （202301AS070002）
