Hypsochromic Shift of Multiple‐Resonance‐Induced Thermally Activated Delayed Fluorescence by Oxygen Atom Incorporation

Herein, we reported an ultrapure blue multiple‐resonance‐induced thermally activated delayed fluorescence (MR‐TADF) material (ν‐DABNA‐O‐Me) with a high photoluminescence quantum yield and a large rate constant for reverse intersystem crossing. Because of restricted π‐conjugation of the HOMO rather t...

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Vydané v:	Angewandte Chemie International Edition Ročník 60; číslo 33; s. 17910 - 17914
Hlavní autori:	Tanaka, Hiroyuki, Oda, Susumu, Ricci, Gaetano, Gotoh, Hajime, Tabata, Keita, Kawasumi, Ryosuke, Beljonne, David, Olivier, Yoann, Hatakeyama, Takuji
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	WEINHEIM Wiley 09.08.2021 Wiley Subscription Services, Inc
Vydanie:	International ed. in English
Predmet:	Chemistry Chemistry, Multidisciplinary Conjugation deep blue Fluorescence Incorporation Molecular orbitals multiple resonance effect narrowband emission organic light-emitting diodes Oxygen Photoluminescence Photons Physical Sciences Quantum efficiency Resonance Science & Technology Service life assessment thermally activated delayed fluorescence BLUE OLEDS EMITTERS organic light-emitting diodes SINGLET LIGHT-EMITTING-DIODES MOLECULAR DESIGN thermally activated delayed fluorescence multiple resonance effect narrowband emission deep blue EMISSION DERIVATIVES HIGH-EFFICIENCY BORYLATION
ISSN:	1433-7851, 1521-3773, 1521-3773
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Shrnutí:	Herein, we reported an ultrapure blue multiple‐resonance‐induced thermally activated delayed fluorescence (MR‐TADF) material (ν‐DABNA‐O‐Me) with a high photoluminescence quantum yield and a large rate constant for reverse intersystem crossing. Because of restricted π‐conjugation of the HOMO rather than the LUMO induced by oxygen atom incorporation, ν‐DABNA‐O‐Me shows a hypsochromic shift compared to the parent MR‐TADF material (ν‐DABNA). An organic light‐emitting diode based on this material exhibits an emission at 465 nm, with a small full‐width at half‐maximum of 23 nm and Commission Internationale de l'Eclairage coordinates of (0.13, 0.10), and a high maximum external quantum efficiency of 29.5 %. Moreover, ν‐DABNA‐O‐Me facilitates a drastically improved efficiency roll‐off and a device lifetime compared to ν‐DABNA, which demonstrates significant potential of the oxygen atom incorporation strategy. A multiple‐resonance‐induced thermally activated delayed fluorescence material that comprised oxygen, nitrogen, and boron atoms (ν‐DABNA‐O‐Me) was synthesized via one‐shot double borylation. An OLED device employing the fabricated ν‐DABNA‐O‐Me exhibits deep‐blue electroluminescence with a small full‐width at half‐maximum and a high external quantum efficiency with minimum efficiency roll‐off.
Bibliografia:	KAKEN ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	1433-7851 1521-3773 1521-3773
DOI:	10.1002/anie.202105032