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240407s2024 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202402289
|2 doi
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|a pubmed25n1235.xml
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|a (DE-627)NLM370705416
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|a (NLM)38581139
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|a DE-627
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|a eng
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|a Weerasinghe, Rangani Wathsala
|e verfasserin
|4 aut
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|a A Boron, Nitrogen, and Oxygen Doped π-Extended Helical Pure Blue Multiresonant Thermally Activated Delayed Fluorescent Emitter for Organic Light Emitting Diodes That Shows Fast kRISC Without the Use of Heavy Atoms
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|c 2024
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 26.06.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2024 The Authors. Advanced Materials published by Wiley‐VCH GmbH.
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|a Narrowband emissive multiresonant thermally activated delayed fluorescence (MR-TADF) emitters are a promising solution to achieve the current industry-targeted color standard, Rec. BT.2020-2, for blue color without using optical filters, aiming for high-efficiency organic light-emitting diodes (OLEDs). However, their long triplet lifetimes, largely affected by their slow reverse intersystem crossing rates, adversely affect device stability. In this study, a helical MR-TADF emitter (f-DOABNA) is designed and synthesized. Owing to its π-delocalized structure, f-DOABNA possesses a small singlet-triplet gap, ΔEST, and displays simultaneously an exceptionally faster reverse intersystem crossing rate constant, kRISC, of up to 2 × 106 s-1 and a very high photoluminescence quantum yield, ΦPL, of over 90% in both solution and doped films. The OLED with f-DOABNA as the emitter achieved a narrow deep-blue emission at 445 nm (full width at half-maximum of 24 nm) associated with Commission Internationale de l'Éclairage (CIE) coordinates of (0.150, 0.041), and showed a high maximum external quantum efficiency, EQEmax, of ≈20%
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|a Journal Article
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|a blue emitter
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|a boron
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|a multiresonant thermally activated delayed fluorescence
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|a organic light‐emitting diodes
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|a reverse intersystem crossing
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|a Madayanad Suresh, Subeesh
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Hall, David
|e verfasserin
|4 aut
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1 |
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|a Matulaitis, Tomas
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Slawin, Alexandra M Z
|e verfasserin
|4 aut
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1 |
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|a Warriner, Stuart
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Lee, Yi-Ting
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chan, Chin-Yiu
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tsuchiya, Youichi
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zysman-Colman, Eli
|e verfasserin
|4 aut
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| 700 |
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|a Adachi, Chihaya
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 36(2024), 26 vom: 08. Juni, Seite e2402289
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnas
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| 773 |
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|g volume:36
|g year:2024
|g number:26
|g day:08
|g month:06
|g pages:e2402289
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|u http://dx.doi.org/10.1002/adma.202402289
|3 Volltext
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