Phosphonium-Based Ionic Thermally Activated Delayed Fluorescence Emitters for High-Performance Partially Solution-Processed Organic Light-Emitting Diodes  

作　　者：Xu-Lin Chen Xiao-Dong Tao Ya-Shu Wang Zhuangzhuang Wei Lingyi Meng Dong-Hai Zhang Fu-Lin Lin Can-Zhong Lu 

机构地区：[1]State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,Fujian 350002 [2]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials,Xiamen Institute of Rare Earth Materials,Haixi Institutes,Chinese Academy of Sciences,Xiamen,Fujian 361021 [3]Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou,Fujian 350108

出　　处：《CCS Chemistry》2023年第3期589-597,共9页中国化学会会刊（英文）

基　　金：This research was made possible as a result of a generous grant from the Key Research Program of Frontier Science,the Chinese Academy of Sciences(CAS)(grant no.QYZDJ-SSW-SLH033);the National Natural Science Foundation of China(grant no.52073286);the Natural Science Foundation of Fujian Province(grant no.2006L2005);the Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China(grant nos.2021ZR132 and 2021ZZ115);the Youth Innovation Foundation of Xiamen City(grant nos.3502Z20206082 and 3502Z20206083);the Major Research Project of Xiamen(grant no.3502Z20191015).

摘　　要：Ionic thermally activated delayed fluorescence(TADF)emitters are rarely investigated due to their poor photoluminescence and electroluminescence performance.Herein,highly efficient ionic TADF emitters with charged donor–acceptor(D–A^(+))and D–A^(+)–D architectures are designed,innovatively based on the phosphonium cation electron acceptor.The symmetric D–A^(+)–D compound in doped film exhibits a high photoluminescence quantum yield of 0.91 and a short emission lifetime of 1.43 microseconds.Partially solution-processed organic lightemitting diodes based on these ionic TADF emitters achieve a maximum external quantum efficiency(EQE)of 18.3%and a peak luminance of 14,532 candelas per square meter(cd/m^(2))and show a small efficiency roll-off of 7.1%(EQE=17%)at a practical high luminance of 1000 cd/m^(2).These results demonstrate the high potential of phosphonium cations as promising electron acceptors to construct TADF emitters for high-performance electroluminescence devices.The current study opens up an appealing way for future exploitation of high-efficiency ionic TADF materials.

关 键 词：cation acceptor charge transfer PHOSPHONIUM ionic emitter thermally activated delayed fluorescence partially solution-processed host-guest organic light-emitting diode efficiency roll-off 

分 类 号：TB34[一般工业技术—材料科学与工程] TN312.8[电子电信—物理电子学]