摘要
全无机镉基金属卤化物CsCdCl_(3)因其独特的三维晶体结构而具有优异的稳定性、宽带自陷激子(Selftrapped excitons,STEs)发射和丰富的离子掺杂格位,在固态照明领域引起了广泛关注。然而,基于八面体畸变的STEs辐射复合的发光效率较低。本文采用简单的室温溶液法制备了一系列Mn^(2+)离子掺杂的六方相CsCdCl_(3)∶x%Mn微米晶。在254 nm紫外光激发下,Mn^(2+)掺杂的样品发出明亮的橙黄光,发射峰位于598 nm处,半峰宽为75 nm,荧光量子产率最高达99.1%。稳态和瞬态荧光光谱测试结果表明,Mn^(2+)掺杂CsCdCl_(3)微米晶的宽光谱发射源自基质的STEs和Mn^(2+)离子的d-d跃迁。同时,该材料还具备优异的空气、热、水稳定性。我们进一步将CsCdCl_(3)∶5%Mn^(2+)荧光粉、商用荧光粉、深紫外或蓝光LED芯片封装成两种白光发光二极管器件,色度坐标分别为(0.36,0.35)和(0.40,0.36),显色指数分别高达91和83,有望成为新一代发光材料用于照明领域。
Owing to its excellent stability and wide self-trapped excitons(STEs)emission induced by the special three-dimensional(3D)crystal structure,all inorganic cadmium-based metal halide perovskite CsCdCl_(3) has attracted broad attention in the field of solid-state lighting.However,the luminescence efficiency through radiative recombination of STEs is not high.Herein,a serious of Mn2+-doped hexagonal CsCdCl_(3)∶x% Mn microcrystals were prepared by a facial room-temperature solution method.Under 254 nm UV excitation,CsCdCl_(3) microcrystals after Mn^(2+)doping show bright orange-yellowish emission peaking at about 598 nm with a full width at half-maximum of 75 nm and the photoluminescence quantum yield of 99.1%.Steady-state and transient photoluminescence results suggest that the broad emission is originating from the matrix STEs and the Mn^(2+)dopant.Meanwhile,the as-synthesized materials also display excellent air,heat,and water stability.Two white light-emitting diodes(LEDs)were further fabricated by integrating a mixture of CsCdCl_(3)∶5% Mn and commercial phosphors on a deep UV LED and a blue LED,which demonstrate bright white light with CIE coordinates of(0.36,0.35)and(0.40,0.36),high color rendering indices of 91 and 83,respectively.The synthesized Mn^(2+)-doped CsCdCl_(3) phosphor holds great promise for new-generation luminescent materials in the field of lighting.
作者
王瑞
张铭
程宋玉
曾敏
周莉
魏立杰
李根
杨柳
胡永明
顾豪爽
李岳彬
WANG Rui;ZHANG Ming;CHENG Songyu;ZENG Min;ZHOU Li;WEI Lijie;LI Gen;YANG Liu;HU Yongming;GU Haoshuang;LI Yuebin(Hubei Key Laboratory of Micro-Nanoelectronic Materials and Devices,School of Microelectronics,Hubei University,Wuhan 430062,China;Jiangsu Etern Company Limited,Suzhou 215211,China;Institute of Industrial Technology at Qianjiang,Hubei University,Qianjiang 433100,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2023年第9期1560-1569,共10页
Chinese Journal of Luminescence
基金
国家自然科学基金(62305108)
湖北省自然科学基金(2022CFB931,2021CFB078,2021CFB493)。
