Tetradentate Pt(Ⅱ)complex as a singlet exciton sensitizing host for highly efficient green fluorescent organic light-emitting diodes

作     者：Unhyeok Jo Seung Chan Kim Chan Hee Ryu Kang Mun Lee Jae-Min Kim Jun Yeob Lee 

作者机构：School of Chemical EngineeringSungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-do 16419Republic of Korea Department of ChemistryInstitute for Molecular Science and Fusion TechnologyKangwon National UniversityChuncheonGangwon 24341Republic of Korea Department of Advanced Materials EngineeringChung-Ang University4726Seodong-daeroDaedeok-myeonAnseong-siGyeonggi-do 17546Republic of Korea SKKU Advanced Institute of Nano TechnologySungkyunkwan University2066Seobu-roJangan-guSuwonGyeonggi 16419Republic of Korea SKKU Institute of Energy Science and TechnologySungkyunkwan University2066Seobu-roJangan-guSuwonGyeonggi 16419Republic of Korea 

出 版 物：《Science China Materials》 (中国科学（材料科学）（英文版）)

年 卷 期：2024年第67卷第8期

页      面：2618-2627页

核心收录：

学科分类：070207[理学-光学] 081704[工学-应用化学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0817[工学-化学工程与技术] 08[工学] 070304[理学-物理化学(含∶化学物理)] 0703[理学-化学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by Chung-Ang University Research Grants in 2023 and MOTIE(20018956) 

主　　题：singlet annihilation polaron 

摘      要：Efficient green fluorescent organic light-emitting diodes were designed with a phosphorescent metal complex as a singlet exciton sensitizing host(SESH)for achieving high efficiency and low efficiency roll-off through exciton and polaron *** Pt(Ⅱ)complex(Pt-Trz)possessing a tetradentate ligand with a bulky blocking group not only suppresses the severe formation of excimer or dimer itself but also transfers radiative excitons to fluorescent dopant *** SESH assisted fluorescence(SESHF)device with Pt-Trz as the host exhibits the maximum external quantum efficiency of 13.3%and a lower efficiency roll-off compared with exciplex host device which is a general approach for harvesting triplet *** exciton dynamics modeling unravels that the SESHF device effectively utilizes triplet excitons in the host by intersystem crossing and resonance energy transfer from the triplet state of the host to the singlet state of the terminal *** quenching rates of the SESHF device are reduced by 11 times for triplet-triplet annihilation and 1.8 times for tripletpolaron annihilation compared with the exciplex device,which demonstrates that Pt-Trz could be a platform to be used as an efficient host for fluorophores.