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Fused‐Nonacyclic Multi‐Resonance Delayed Fluorescence Emitter Based on Ladder‐Thiaborin Exhibiting Narrowband Sky‐Blue Emission with Accelerated Reverse Intersystem Crossing
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- Masakazu Nagata
- Department of Quantum Beam Science Graduate School of Science and Engineering Ibaraki University 4-12-1 Naka-narusawa, Hitachi Ibaraki 316-8511 Japan
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- Hyukgi Min
- INAMORI Frontier Research Center (IFRC) and Department of Applied Chemistry Graduate School of Engineering Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
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- Erika Watanabe
- Department of Quantum Beam Science Graduate School of Science and Engineering Ibaraki University 4-12-1 Naka-narusawa, Hitachi Ibaraki 316-8511 Japan
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- Hiroki Fukumoto
- Department of Quantum Beam Science Graduate School of Science and Engineering Ibaraki University 4-12-1 Naka-narusawa, Hitachi Ibaraki 316-8511 Japan
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- Yoshiyuki Mizuhata
- Institute for Chemical Research Kyoto University Gokasho, Uji Kyoto 611-0011 Japan
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- Norihiro Tokitoh
- Institute for Chemical Research Kyoto University Gokasho, Uji Kyoto 611-0011 Japan
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- Tomohiro Agou
- Department of Quantum Beam Science Graduate School of Science and Engineering Ibaraki University 4-12-1 Naka-narusawa, Hitachi Ibaraki 316-8511 Japan
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- Takuma Yasuda
- INAMORI Frontier Research Center (IFRC) and Department of Applied Chemistry Graduate School of Engineering Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
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Description
<jats:title>Abstract</jats:title><jats:p>Developing organic luminophores with unique capability of strong narrowband emission is both crucial and challenging for the further advancement of organic light‐emitting diodes (OLEDs). Herein, a nanographitic fused‐nonacyclic π‐system (<jats:bold>BSBS‐N1</jats:bold>), which was strategically embedded with multiple boron, nitrogen, and sulfur atoms, was developed as a new multi‐resonance thermally activated delayed fluorescence (MR‐TADF) emitter. Narrowband sky‐blue emission with a peak at 478 nm, full width at half maximum of 24 nm, and photoluminescence quantum yield of 89 % was obtained with <jats:bold>BSBS‐N1</jats:bold>. Additionally, the spin‐orbit coupling was enhanced by incorporating two sulfur atoms, thereby facilitating the spin‐flipping process between the excited triplet and singlet states. OLEDs based on <jats:bold>BSBS‐N1</jats:bold> as a sky‐blue MR‐TADF emitter achieved a high maximum external electroluminescence quantum efficiency of 21.0 %, with improved efficiency roll‐off.</jats:p>
Journal
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- Angewandte Chemie International Edition
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Angewandte Chemie International Edition 60 (37), 20280-20285, 2021-08-09
Wiley
