Tetradentate Pt(Ⅱ)complex as a singlet exciton sensitizing host for highly efficient green fluorescent organic light-emitting diodes
Unhyeok Jo 1Seung Chan Kim 1Chan Hee Ryu 2Kang Mun Lee 2Jae-Min Kim 3Jun Yeob Lee4
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作者信息
1. School of Chemical Engineering,Sungkyunkwan University,2066,Seobu-ro,Jangan-gu,Suwon-si,Gyeonggi-do,16419,Republic of Korea
2. Department of Chemistry,Institute for Molecular Science and Fusion Technology,Kangwon National University,Chuncheon,Gangwon 24341,Republic of Korea
3. Department of Advanced Materials Engineering,Chung-Ang University,4726 Seodong-daero,Daedeok-myeon,Anseong-si,Gyeonggi-do 17546,Republic of Korea
4. School of Chemical Engineering,Sungkyunkwan University,2066,Seobu-ro,Jangan-gu,Suwon-si,Gyeonggi-do 16419,Republic of Korea;SKKU Advanced Institute of Nano Technology,Sungkyunkwan University,2066,Seobu-ro,Jangan-gu,Suwon,Gyeonggi 16419,Republic of Korea;SKKU Institute of Energy Science and Technology,Sungkyunkwan University,2066,Seobu-ro,Jangan-gu,Suwon,Gyeonggi 16419,Republic of Korea
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Abstract
Efficient green fluorescent organic light-emit-ting diodes were designed with a phosphorescent metal com-plex as a singlet exciton sensitizing host(SESH)for achieving high efficiency and low efficiency roll-off through exciton and polaron management.Tetradentate 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 do-pant effectively.The SESH assisted fluorescence(SESHF)de-vice 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 ap-proach for harvesting triplet excitons.Numerical exciton dy-namics 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 emitter.Bimolecular quenching rates of the SESHF device are reduced by 11 times for triplet-triplet annihilation and 1.8 times for triplet-polaron annihilation compared with the exciplex device,which demonstrates that Pt-Trz could be a platform to be used as an efficient host for fluorophores.
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