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 

机构地区：[1]Key Laboratory of Rubber-Plastics,Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics,School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042 [2]National Laboratory for Molecular Sciences,Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190 [3]Department of Chemistry,University of Chinese Academy of Sciences,Beijing 100049 [4]Shandong Engineering Research Center of Aeronautical Materials and Devices,College of Aeronautical Engineering,Binzhou University,Binzhou 251900 [5]State Key Laboratory of Chemical Resource Engineering,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029

出　　处：《CCS Chemistry》2024年第9期2346-2357,共12页中国化学会会刊（英文）

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.

摘　　要：High-efficiency electroluminescent devices featuring simplified architecture have received considerable attention due to significant advantages in construction procedures and commercialized applications.However,there still remains a critical challenge with regard to the lack of organic semiconductors that simultaneously possess high luminescent efficiency and balanced carrier-transporting abilities.Herein,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 skeleton.The 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 1.08.Eventually,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 fields.This work provides a new avenue to develop a high-efficiency bipolar TADF emitter to advance the simplified electroluminescent devices.

关 键 词：organic light-emitting diode organic lightemitting transistor BIPOLAR thermally activated delayed fluorescence nondoped active layer 

分 类 号：O657[理学—分析化学]