摘要
铜(Ⅰ)基金属卤化物作为新一代环境友好的发光材料受到了研究者的广泛关注。本文采用溶剂辅助结晶法设计制备了一种新型零维金属卤化物发光材料(C_(12)H_(24)O_(6))NaCuBr_(2)。在365 nm激发下,该化合物呈现出半峰宽为346 nm的超宽带橙红色发射,光致发光量子产率为42.6%。基于低温光谱、激发波长依赖的发射光谱和理论计算研究表明,峰值700 nm处的超宽带发射来自于Cu^(+)离子3d轨道和Br^(-)离子4p轨道间相互作用形成的简并能级。在低温下,(C_(12)H_(24)O_(6))NaCuBr_(2)的晶格畸变导致能级的简并度降低,其荧光发射包含峰值为629 nm和735 nm的两个发射带。在高能激发下,电子跃迁到(C_(12)H_(24)O_(6))NaCuBr_(2)的更高能级S3而带来的发射与77 K下观测到的480 nm处的发射峰相对应。采用(C_(12)H_(24)O_(6))NaCuBr_(2)制备的白光发光二极管(LED)器件的显色指数高达90.6,表明其在全光谱照明领域具有潜在的应用前景。
Cu(Ⅰ)-based metal halides,as a new generation of environment-friendly luminescent materials,have attracted extensive attention.Herein,a novel zero-dimensional Cu(Ⅰ)-based metal halide(C_(12)H_(24)O_(6))NaCuBr_(2)was prepared by solution assisted crystallization method.Under 365 nm excitation,(C_(12)H_(24)O_(6))NaCuBr_(2)single crystal exhibits ultra-broadband orange red emission with the full width at half maximum of 346 nm and the photoluminescence quantum yield of 42.6%.Theoretical calculation and experimental studies on the low temperature and excitation-dependent emission spectra show that the ultra-broadband emission peaking at 700 nm is derived from the formation of a degenerate energy level by the interaction between the 3d orbital of the Cu^(+) ion and the 4p orbital of the Br^(-) ion.At low temperature,the degeneracy of the energy level is reduced due to the lattice distortion,and the emission peak at 700 nm is split into two emission peaks at 629 nm and 735 nm,respectively.In addition,the electron is excited to a higher energy level of S3 for(C_(12)H_(24)O_(6))NaCuBr_(2)under high energy excitation,which corresponds to the emission peak at 480 nm observed at 77 K.The white light-emitting diode(LED)device prepared using(C_(12)H_(24)O_(6))NaCuBr_(2)possesses a color rendering index as high as 90.6,indicating their potential application in the field of full-spectrum lighting.
作者
黄敬龙
金建策
苏彬彬
夏志国
HUANG Jinglong;JIN Jiancte;SU Binbin;XIA Zhiguo(The State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices,School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China;School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510641,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2023年第3期528-536,共9页
Chinese Journal of Luminescence
基金
国家自然科学基金(51961145101)
广州市科技计划项目(202007020005)
广东省珠江人才计划本地创新团队项目(2017BT01X137)。
关键词
零维结构
Cu基金属卤化物
全光谱照明
zero-dimensional structure
Cu-based metal halides
full-spectrum lighting
