Simple Double Hetero[5]helicenes Realize Highly Efficient and Narrowband Circularly Polarized Organic Light-Emitting Diodes  

作　　者：Wei Yang Nengquan Li Jingsheng Miao Lisi Zhan Shaolong Gong Zhongyan Huang Chuluo Yang 

机构地区：[1]Department of Chemistry,Renmin Hospital of Wuhan University,Hubei Key Lab on Organic and Polymeric Optoelectronic Materials,Wuhan University,Wuhan 430072 [2]College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060

出　　处：《CCS Chemistry》2022年第11期3463-3471,共9页中国化学会会刊（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(grant nos.52130308,51903160,and 52022071);Shenzhen Science and Technology Program(grant no.KQTD20170330110107046);the Shenzhen Technology and Innovation Commission(grant no.JCYJ20180507182244027).

摘　　要：Helicene-based emitters with unique inherent circularly polarized luminescence(CPL)are promising yet remain a formidable challenge for highly efficient circularly polarized organic light-emitting diodes(CP-OLEDs),ascribed to their tough synthesis,low emission efficiency,and easy racemization in the thermal deposition process.Herein,a pair of helicenebased enantiomers,namely(P)-helicene-BN and(M)-helicene-BN,were developed,which merge helical chirality and the B/N/S inserted polycyclic aromatic framework to concurrently feature CPL and narrow thermally activated delayed fluorescence(TADF)characteristics.Benefiting from the excellent thermal/photophysical/chiroptical properties,the narrowband green CP-OLEDs based on enantiomers achieved maximum external quantum efficiencies(EQE_(max))of up to 31.5%,and dissymmetry factor(|g_(EL)|)of 2.2×10^(−3).This work reveals the great potential of helicene-based emitters in CP-OLEDs.

关 键 词：helical chirality multiple-resonance thermally activated delayed fluorescence circularly polarized organic light-emitting diodes double helicene 

分 类 号：O62[理学—有机化学]