摘要
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Mn4+的特征宽带激发,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%)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,该样品表现出荧光负热猝灭效应,其在120℃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+))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。
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%)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%)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∶Mn^(4+)(13.18%)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 onβ-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+)redemitting crystals exhibit potential application in white LEDs.
作者
蒋琼芳
杨奇林
李香归
胡雪梅
周强
汪正良
JIANG Qiongfang;YANG Qilin;LI Xianggui;HU Xuemei;ZHOU Qiang;WANG Zhengliang(Key Laboratory of Green-chemistry Materials in University of Yunnan Province,School of Chemistry&Environment,Yunnan Minzu University,Kunming 650500,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2023年第12期2180-2187,共8页
Chinese Journal of Luminescence
基金
国家自然科学基金(22165033)
云南省基础研究计划重点项目(202301AS070002)。
关键词
红光晶体
氟化物
发光性能
白光LED
red-emitting crystals
fluorides
luminescent properties
white LEDs
