Optimization of boron-containing acceptors towards high-efficiency TADF emitters:sky-blue OLEDs with external quantum efficiency of 32.6%  

含硼受体的高效热活化延迟荧光材料:外量子效率高达32.6%的天蓝色有机发光二极管

作　　者：Xu Gong Wei Yang He Zhang Weimin Ning Shaolong Gong Xiang Gao Chuluo Yang 巩旭;杨威;张贺;宁为民;龚少龙;高翔;杨楚罗(Department of Chemistry,Renmin Hospital of Wuhan University,Hubei Key Lab on Organic and Polymeric Optoelectronic Materials,Wuhan University,Wuhan 430072,China;Department of Pharmacy,Renmin Hospital of Wuhan University,Wuhan 430060,China;Shenzhen Key Laboratory of New Information Display and Storage Materials,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,China)

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,China [2]Department of Pharmacy,Renmin Hospital of Wuhan University,Wuhan 430060,China [3]Shenzhen Key Laboratory of New Information Display and Storage Materials,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,China

出　　处：《Science China Materials》2024年第11期3537-3542,共6页中国科学（材料科学）（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(52130308 and 52022071);the financial support from the Shenzhen Science and Technology Program(JCYJ20220818095816036 and ZDSYS20210623091813040)。

摘　　要：Two new thermally activated delayed fluorescence(TADF)molecules,13-(2,12-di-tert-butyl-5,9-dioxa-13bboranaphtho[3,2,1-de]anthracen-7-yl)-5,5-dimethyl-5,13-dihydrobenzo[4,5]thieno[3,2-c]acridine(BOBT)and 13-(4-(dimesitylboranyl)-3,5-dimethylphenyl)-5,5-dimethyl-5,13-dihydrobenzo[4,5]thieno[3,2-c]acridine(BPBT),are constructed via connecting the 5,5-dimethyl-5,13-dihydrobenzo[4,5]thieno[3,2-c]acridine(BTDMAC)donor(D)with triarylboron or oxygen-bridged cyclized boron acceptors(A),respectively.In comparison with the photoluminescence quantum yield(PLQY)of 84%for BPBT,BOBT shows a higher PLQY of 100%,due to the multi-resonance effect of the boron-oxygen skeleton.In addition,the D-A-type molecular structural characteristic endows the boron-containing BOBT emitter with a fast reverse intersystem crossing rate on the order of 106 s^(-1).The sky-blue organic light-emitting diode(OLED)employing the BOBT emitter achieves state-of-the-art device performances with a high external quantum efficiency of 32.6%.两个新热活化延迟荧光(TADF)分子BOBT和BPBT,分别通过连接BTDMAC给体(D)和三芳基硼或氧桥环化硼受体(A)构建而成.BPBT的光致发光量子产率(PLQY)为84%,与之相比,BOBT由于硼氧骨架的多重共振效应而具有更高的PLQY,高达100%.D-A分子的结构特征,使得含硼的BOBT分子具有约10^(6)s^(-1)的快速反系间窜越速率.以BOBT制备的天蓝光有机发光二极管(OLED)实现了高达32.6%的最大外量子效率.

关 键 词：organic light-emitting diodes thermally activated delayed fluorescence boron-containing acceptor 

分 类 号：TN383.1[电子电信—物理电子学] TB34[一般工业技术—材料科学与工程]