Copper(Ⅰ) complexes with planar chirality realize efficient circularly polarized electroluminescence  

作　　者：Ao Ying Lisi Zhan Yao Tan Xiaosong Cao Chuluo Yang Shaolong Gong 

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

出　　处：《Science China Chemistry》2023年第8期2274-2282,共9页中国科学（化学英文版）

基　　金：financial support from the National Natural Science Foundation of China(52022071 and 51873158)。

摘　　要：Chiral organometallic emitters hold great promise in potential and practical applications of circularly polarized organic lightemitting diodes(CP-OLEDs).However,developing luminescent earth-abundant organometallic complexes concurrently exhibiting circularly polarized luminescence(CPL)and high quantum efficiency remains a formidable challenge.In this study,we introduced a typical planar chiral skeleton of a[2.2]paracyclophane moiety into earth-abundant copper(I)complexes with the goal of realizing efficient CPL and thermally activated delayed fluorescence(TADF)simultaneously.Two pairs of proof-of-theconcept copper(I)enantiomers,R_(p)/S_(p)-MAC^(*)-Cu-CzP and R_(p)/S_(p)-MAC^(*)-Cu-CNCzP,were developed using planar chiral[2.2]paracyclophane-based donor ligands in a carbene-metal-amide(CMA)motif.Both panels of enantiomers not only exhibited significant mirror-image CPL signals but also displayed distinct TADF nature with fast reverse intersystem crossing rates of up to 10^(8)s^(-1).The resultant OLEDs based on the MAC^(*)-Cu-Cz P enantiomers manifested efficient circularly polarized electroluminescence with excellent external quantum efficiencies of 13.2%and ultraslow efficiency roll-off(7.7%at 10,000 nits).This article not only demonstrates one of the best performances for CP-OLEDs based on earth-abundant organometallic complexes but also represents the first example of CP-OLEDs from CMA complexes to our knowledge.

关 键 词：circularly polarized luminescence(CPL) organic light-emitting diode(OLED) copper(Ⅰ)complex carbene-metal-amide(CMA) thermally activated delayed fluorescence(TADF) 

分 类 号：O641.4[理学—物理化学] TN383.1[理学—化学]