Bipolar Thermally Activated Delayed Fluorescence Emitter with Balanced Carrier Transport for High-Efficiency Nondoped Green Electroluminescent Devices

作     者：Yuchao Liu Zhagen Miao Haikuo Gao Shian Ying Can Gao Shouke Yan Huanli Dong Zhongjie Ren 

作者机构：Key Laboratory of Rubber-PlasticsMinistry of Education/Shandong Provincial Key Laboratory of Rubber-PlasticsSchool of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042 National Laboratory for Molecular SciencesKey Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190 Department of ChemistryUniversity of Chinese Academy of SciencesBeijing 100049 Shandong Engineering Research Center of Aeronautical Materials and DevicesCollege of Aeronautical EngineeringBinzhou UniversityBinzhou 251900 State Key Laboratory of Chemical Resource EngineeringCollege of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029 

出 版 物：《CCS Chemistry》 (中国化学会会刊（英文）)

年 卷 期：2024年第6卷第9期

页      面：2346-2357页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0703[理学-化学] 

基　　金：financial support from the National Natural Science Foundation of China(grant nos.52103220,52273164,and 52233010) the Shandong Provincial Natural Science Foundation(grant nos.ZR2022ZD37 and ZR2023QE078) the Ministry of Science and Technology of China(grant nos.2022YFB3603800 and 2018YFA0703200) the Fundamental Research Funds for the Central Universities(grant no.QNTD20) the Beijing National Laboratory for Molecular Sciences(grant no.BNLMS-CXXM-202012) the Natural Science Foundation of Qingdao(grant no.23-2-1-75-zyyd-jch) the Shandong Provincial Regular Undergraduate University Teacher Visiting and Training Fund 

主　　题：organic light-emitting diode organic lightemitting transistor bipolar thermally activated delayed fluorescence nondoped active layer 

摘      要：High-efficiency electroluminescent devices featuring simplified architecture have received considerable attention due to significant advantages in construction procedures and commercialized ***,there still remains a critical challenge with regard to the lack of organic semiconductors that simultaneously possess high luminescent efficiency and balanced carrier-transporting ***,we design a thermally activated delayed fluorescence(TADF)emitter 4-(9,9-dimethyl-9,10-dihydroacridine)-4′-triphenylphosphineoxide-benzophenone(DMAC-BPTPO)by incorporating triphenylphosphine oxide into the donor–acceptor *** accessional electrontransporting moiety,rod-like dimer,and horizontally packing model synergistically enable DMAC-BP-TPO which possesses an excellent photoluminescence quantum yield of nearly 90%with a reverse intersystem crossing rate constant of 2.0×106 s−1,horizontal dipole ratio of 89%,and a balanced electron and hole mobilities with a small constrast ratio of ***,simplified electroluminescent devices including organic lightemitting diodes(OLEDs)and organic light-emitting transistors(OLETs)incorporating DMAC-BP-TPO-based nondoped film are demonstrated due to their superior integrated optoelectronic properties along with preferable horizontal dipole orientation.A record-high external quantum efficiency value of 21.7%and 4.4%are finally achieved in the simplified nondoped OLED and OLET devices,which are among the highest values in the related research *** work provides a new avenue to develop a high-efficiency bipolar TADF emitter to advance the simplified electroluminescent devices.