An efficient aggregation-enhanced delayed fluorescence luminogen created with spiro donors and carbonyl acceptor for applications as an emitter and sensitizer in high-performance organic light-emitting diodes  

作　　者：Hao Chen Jiajie Zeng Ruishan Huang Jianghui Wang Junchu He Hao Liu Dezhi Yang Dongge Ma Zujin Zhao Ben Zhong Tang 

机构地区：[1]State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates,South China University of Technology,Guangzhou,China [2]School of Science and Engineering,Shenzhen Institute of Aggregate Science and Technology,The Chinese University of Hong Kong,Shenzhen,Guangdong,China [3]AIE Institute,Guangzhou Development District,Huangpu,Guangzhou,China

出　　处：《Aggregate》2023年第2期146-155,共10页聚集体（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:21788102;Natural Science Foundation of Guangdong Province,Grant/Award Number:2019B030301003。

摘　　要：Organic light-emitting diodes(OLEDs)fabricated using organic thermally activated delayed fluorescence materials as sensitizers have recently achieved significant advancements,but the serious efficiency roll-offs are still troublesome in most cases.Herein,a tailor-made multifunctional luminogen SBF-BP-SFAC containing 9,9′-spirobifluorene(SBF)and spiro[acridine-9,9-fluorene](SFAC)as electron donors and carbonyl as an electron acceptor is synthesized and characterized.SBF-BPSFAC has the advantages of high thermal stability,aggregation-enhanced delayed fluorescence,and balanced carrier transport ability,and prefers horizontal dipole orientation.Highly efficient OLEDs employing SBF-BP-SFAC as an emitter radiate intense cyan light with outstanding external quantum efficiencies(ηexts)of up to 30.6%.SBF-BP-SFAC can also serve as an excellent sensitizer for orange fluorescence,phosphorescence,and delayed fluorescence materials,providing excellent η exts of up to 30.3% with very small efficiency roll-offs due to the fast Förster energy transfer as well as exciton annihilation suppression by bulky spiro donors.These outstanding performances demonstrate the great potential of SBF-BP-SFAC as an emitter and sensitizer for OLEDs.

关 键 词：aggregation-enhanced emission bipolar carrier transport organic light-emitting diode SENSITIZER thermally activated delayed fluorescence 

分 类 号：TN312.8[电子电信—物理电子学]