Solution‐Processable Pure Green Thermally Activated Delayed Fluorescence Emitter Based on the Multiple Resonance Effect

Thermally activated delayed fluorescence (TADF) materials based on the multiple resonance (MR) effect are applied in organic light‐emitting diodes (OLEDs), combining high color purity and efficiency. However, they are not fabricated via solution‐processing, which is an economical approach toward the...

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Bibliographic Details
Published in:Advanced materials (Weinheim) Vol. 32; no. 40; pp. e2004072 - n/a
Main Authors: Ikeda, Naoya, Oda, Susumu, Matsumoto, Ryuji, Yoshioka, Mayu, Fukushima, Daisuke, Yoshiura, Kazuki, Yasuda, Nobuhiro, Hatakeyama, Takuji
Format: Journal Article
Language:English
Published: Weinheim Wiley Subscription Services, Inc 01.10.2020
Subjects:
Boron
Efficiency
Electroluminescence
Emitters
Energy gap
Fluorescence
Interlayers
Ionization potentials
Mass production
Materials science
Molecular orbitals
multiple resonance effect
Organic light emitting diodes
Oxygen atoms
Photoluminescence
Polymers
pure green
Quantum efficiency
Resonance
solution‐processable
Synthesis
thermally activated delayed fluorescence
ISSN:0935-9648, 1521-4095, 1521-4095
Online Access:Get full text
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Summary:Thermally activated delayed fluorescence (TADF) materials based on the multiple resonance (MR) effect are applied in organic light‐emitting diodes (OLEDs), combining high color purity and efficiency. However, they are not fabricated via solution‐processing, which is an economical approach toward the mass production of OLED displays. Here, a solution‐processable MR‐TADF material (OAB‐ABP‐1), with an extended π‐skeleton and bulky substituents, is designed. OAB‐ABP‐1 is synthesized from commercially available starting materials via a four‐step process involving one‐shot double borylation. OAB‐ABP‐1 presents attractive photophysical properties, a narrow emission band, a high photoluminescence quantum yield, a small energy gap between S1 and T1, and low activation energy for reverse intersystem crossing. These properties are attributed to the alternating localization of the highest occupied and lowest unoccupied molecular orbitals induced by the boron, nitrogen, and oxygen atoms. Furthermore, to facilitate charge recombination, two novel semiconducting polymers with similar ionization potentials to that of OAB‐ABP‐1 are synthesized for use as interlayer and emissive layer materials. A solution‐processed OLED device is fabricated using OAB‐ABP‐1 and the aforementioned polymers; it exhibits pure green electroluminescence with a small full‐width at half‐maximum and a high external quantum efficiency with minimum efficiency roll‐off. A thermally activated delayed fluorescence material featuring a multiple resonance effect of boron, nitrogen, and oxygen atoms (OAB‐ABP‐1) is synthesized by one‐shot double borylation. A solution‐processed organic light‐emitting diode (OLED) device using OAB‐ABP‐1 exhibits pure green electroluminescence with a small full‐width at half‐maximum, and a high external quantum efficiency with minimum efficiency roll‐off.
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ISSN:0935-9648
1521-4095
1521-4095
DOI:10.1002/adma.202004072