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- W3204311910 abstract "Enhancing the reverse intersystem crossing (RISC) process of thermally activated delayed fluorescent (TADF) emitters is an effective approach to realize efficient organic light-emitting diodes (OLEDs) with low efficiency roll-off. In this work, we designed two novel TADF emitters, SAT-DAC and SATX-DAC, via a spiro architecture. Efficient maximum external quantum efficiencies (EQEs) of 22.6 and 20.9% with reduced efficiency roll-off (EQEs of 17.9 and 17.0% at 1000 cd m-2) were achieved via a two-RISC-channel strategy. X-ray diffraction shows close donor (D)/acceptor (A) spacing and suitable D/A orientation in crystals of the two emitters favoring both intra- and intermolecular through-space charge transfer (TSCT) processes. Transient photoluminescence decay measurements show that both emitters have two RISC channels leading to kISCT exceeding 106 s-1. These results suggest that the two-RISC-channel design can be a novel approach for enhancing performance of TADF emitters, in particular at high excitation densities." @default.
- W3204311910 created "2021-10-11" @default.
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- W3204311910 date "2021-10-06" @default.
- W3204311910 modified "2023-10-16" @default.
- W3204311910 title "Two-Channel Space Charge Transfer-Induced Thermally Activated Delayed Fluorescent Materials for Efficient OLEDs with Low Efficiency Roll-Off" @default.
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- W3204311910 doi "https://doi.org/10.1021/acsami.1c12627" @default.
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