Molecular Engineering of Thermally Activated Delayed Fluorescence Emitters with Aggregation-Induced Emission via Introducing Intramolecular Hydrogen-Bonding Interactions for Efficient Solution-Processed Nondoped OLEDs

被引:51
作者
Ma, Fulong [1 ]
Zhao, Guimin [1 ]
Zheng, Yu [1 ]
He, Fangru [1 ]
Hasrat, Kamran [1 ]
Qi, Zhengjian [1 ]
机构
[1] Southeast Univ, Sch Chem & Chem Engn, Jiangsu Prov Hitech Key Lab Biomed Res, Nanjing 211189, Jiangsu, Peoples R China
关键词
organic light-emitting diodes (OLEDs); solution-processed; nondoped; thermally activated delayed fluorescence (TADF); aggregation-induced emission (AIE); LIGHT-EMITTING-DIODES; CHARGE-TRANSFER; ROLL-OFF; RATIONAL DESIGN; PURE BLUE; POLYMERS; DONOR; ELECTROLUMINESCENCE; STRATEGY;
D O I
10.1021/acsami.9b17545
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Purely organic luminescent materials concurrently exhibiting thermally activated delayed fluorescence (TADF) and aggregation-induced emission (AIE) features are in great demand due to their high efficiency in aggregation-state toward efficient nondoped OLEDs. Herein, a class of TADF emitters adopting phenyl(pyridyl)methanone as electron-accepting segments and di(tert-butyl)carbazole and 9,9-dimethyl-9,10-dihydroacridine (or phenoxazine) as electron-donating groups are designed and synthesized. The existence of intramolecular hydrogen bonding is conducive to minish the energy difference between a singlet and a triplet (Delta E-st), suppress nonradiative decay, and increase the luminescence efficiency. By using 3CPyM-DMAC as the emitter, the nondoped device via a solution process realize a high current efficiency (CE) and external quantum efficiency (EQE) of 35.4 cd A(-1) and 11.4%, respectively, which is superior to that of CBM-DMAC with a CE and EQE of 14.3 cd A(-1) and 6.7%. This work demonstrates a promising tactic to the establishment of TADF emitters with AIE features via introducing intramolecular hydrogen bonding.
引用
收藏
页码:1179 / 1189
页数:11
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