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231226s2023 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202208378
|2 doi
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|a pubmed24n1168.xml
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|a (DE-627)NLM350466246
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|a (NLM)36534824
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|a DE-627
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|a eng
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|a Wang, Junjie
|e verfasserin
|4 aut
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|a Metal-Perturbed Multiresonance TADF Emitter Enables High-Efficiency and Ultralow Efficiency Roll-Off Nonsensitized OLEDs with Pure Green Gamut
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|c 2023
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 10.02.2023
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|a Date Revised 10.02.2023
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2022 Wiley-VCH GmbH.
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|a Multiresonance (MR)-induced thermally activated delayed fluorescence (TADF) emitters based on B- and N-embedded polycyclic aromatics are desirable for ultrahigh-definition organic light-emitting diodes (OLEDs) due to their high photoluminescence quantum yield (PLQY) and narrow bandwidth. But the reverse intersystem crossing (RISC) rates of MR-TADF emitters are usually small, resulting in severe device efficiency roll-off at high brightness. To solve this issue, a sensitizer for the MR-TADF emitter has been required. Herein, a new MR-TADF emitter is developed through coordination of Au with B/N-embedded polycyclic ligand. Benefitting from the Au perturbation, the RISC rate is dramatically accelerated to 2.3 × 107 s-1 , leading to delayed fluorescence lifetime as short as 4.3 µs. Meanwhile, the PLQY of 95% and full width at half maximum of 39 nm (0.18 eV) are essentially unchanged after metal coordination. Therefore, a high PLQY, short delayed fluorescence lifetime, and high color purity are concurrently realized in a single TADF emitter. Accordingly, vacuum-deposited OLEDs exhibit high-performance electroluminescence with a maximum external quantum efficiency (EQE) of 35.8% without sensitization. The EQE is maintained as high as 32.3% at 10 000 cd m-2 . Furthermore, solution-processed OLED based on the emitter also achieves excellent performance with a maximum EQE of 25.7% and a small efficiency roll-off
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|a Journal Article
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|a metal-perturbation
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|a multiresonance
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|a narrowband emission
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|a organic light-emitting diode
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|a thermally activated delayed fluorescence
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|a Li, Nengquan
|e verfasserin
|4 aut
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|a Zhong, Cheng
|e verfasserin
|4 aut
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|a Miao, Jingsheng
|e verfasserin
|4 aut
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|a Huang, Zhongyan
|e verfasserin
|4 aut
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|a Yu, Mingxin
|e verfasserin
|4 aut
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|a Hu, Yu Xuan
|e verfasserin
|4 aut
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|a Luo, Sai
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|4 aut
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|a Zou, Yang
|e verfasserin
|4 aut
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|a Li, Kai
|e verfasserin
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| 700 |
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|a Yang, Chuluo
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 35(2023), 6 vom: 03. Feb., Seite e2208378
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
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|g volume:35
|g year:2023
|g number:6
|g day:03
|g month:02
|g pages:e2208378
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|u http://dx.doi.org/10.1002/adma.202208378
|3 Volltext
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