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231226s2022 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202202464
|2 doi
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|a pubmed25n1142.xml
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|a (DE-627)NLM342830864
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|a DE-627
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|a eng
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|a Lee, Ha Lim
|e verfasserin
|4 aut
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|a Multiple-Resonance Extension and Spin-Vibronic-Coupling-Based Narrowband Blue Organic Fluorescence Emitters with Over 30% Quantum Efficiency
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|c 2022
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|a Text
|b txt
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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 Revised 18.08.2022
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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 Achieving narrow-bandwidth emission and high external quantum efficiency (EQE) simultaneously is a challenge for next-generation blue-emitting organic light-emitting diodes (OLEDs). In this study, novel multiple-resonance thermally activated delayed fluorescence (MR-TADF) emitters are developed by fusing an indolocarbazole unit with two carbazole skeletons using para-oriented nitrogen atoms. The resulting rigid and planar π-system without electron-accepting atoms exhibits pure blue photoluminescence at 470 nm, reaching a 100% quantum yield with a full-width-at-half-maximum (FWHM) of 25 nm. Higher-level quantum chemistry calculations confirm an MR effect within the extended π-conjugation and an enhanced triplet-to-singlet crossover (104 s-1 ) through a reduced energy gap (ΔEST ) coupled with large spin-vibronic coupling mediated by low-lying triplet excited states. An OLED fabricated using the MR-TADF emitter with CIE color coordinates of (0.12, 0.16) exhibits a record high EQE of 30.9% and a small FWHM of 23 nm. With further optimization of the device structure, a high EQE of 33.8% is achieved without additional outcoupling enhancements owing to the near-perfect horizontal alignment of the emitting dipoles
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|a Journal Article
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|a blue emission
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|a multiple-resonance
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|a organic light-emitting diodes
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|a spin-vibronic coupling
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|a thermally activated delayed fluorescence
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|a Jeon, Soon Ok
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kim, Inkoo
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kim, Seung Chan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Lim, Junseop
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kim, Joonghyuk
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Park, Sangho
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chwae, Jun
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Son, Won-Joon
|e verfasserin
|4 aut
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| 700 |
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|a Choi, Hyeonho
|e verfasserin
|4 aut
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| 700 |
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|a Lee, Jun Yeob
|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 34(2022), 33 vom: 20. Aug., Seite e2202464
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnas
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| 773 |
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|g volume:34
|g year:2022
|g number:33
|g day:20
|g month:08
|g pages:e2202464
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|u http://dx.doi.org/10.1002/adma.202202464
|3 Volltext
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