Red/Near‐Infrared Thermally Activated Delayed Fluorescence OLEDs with Near 100 % Internal Quantum Efficiency

Developing red thermally activated delayed fluorescence (TADF) emitters, attainable for both high‐efficient red organic light‐emitting diodes (OLEDs) and non‐doped deep red/near‐infrared (NIR) OLEDs, is challenging. Now, two red emitters, BPPZ‐PXZ and mDPBPZ‐PXZ, with twisted donor–acceptor structur...

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Published in:Angewandte Chemie 2019-10, Vol.131 (41), p.14802-14807
Main Authors: Chen, Jia‐Xiong, Tao, Wen‐Wen, Chen, Wen‐Cheng, Xiao, Ya‐Fang, Wang, Kai, Cao, Chen, Yu, Jia, Li, Shengliang, Geng, Feng‐Xia, Adachi, Chihaya, Lee, Chun‐Sing, Zhang, Xiao‐Hong
Format: Article
Language:English
Subjects:
Chemical synthesis
Chemistry
Diodes
Efficiency
Emission
Emitters
Energy dissipation
Energy loss
Fluorescence
Moleküldesign
OLEDs
Organic light emitting diodes
Photoluminescence
Photons
Pyridines
Quantum efficiency
Rote/NIR-Emission
Starre Segmente
Thermisch aktivierte verzögerte Fluoreszenz
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Summary:Developing red thermally activated delayed fluorescence (TADF) emitters, attainable for both high‐efficient red organic light‐emitting diodes (OLEDs) and non‐doped deep red/near‐infrared (NIR) OLEDs, is challenging. Now, two red emitters, BPPZ‐PXZ and mDPBPZ‐PXZ, with twisted donor–acceptor structures were designed and synthesized to study molecular design strategies of high‐efficiency red TADF emitters. BPPZ‐PXZ employs the strictest molecular restrictions to suppress energy loss and realizes red emission with a photoluminescence quantum yield (ΦPL) of 100±0.8 % and external quantum efficiency (EQE) of 25.2 % in a doped OLED. Its non‐doped OLED has an EQE of 2.5 % owing to unavoidable intermolecular π–π interactions. mDPBPZ‐PXZ releases two pyridine substituents from its fused acceptor moiety. Although mDPBPZ‐PXZ realizes a lower EQE of 21.7 % in the doped OLED, its non‐doped device shows a superior EQE of 5.2 % with a deep red/NIR emission at peak of 680 nm. Zwei rote Emitter, BPPZ‐PXZ und mDPBPZ‐PXZ, mit verdrehten Donor‐Akzeptor‐Strukturen wurden synthetisiert und genutzt, um Moleküldesignstrategien für hocheffiziente rote TADF‐Emitter zu studieren. BPPZ‐PXZ hat die restriktivste Struktur zur Unterdrückung von Energieverlusten und realisiert rote Emissionen mit einer Photolumineszenzquantenausbeute (ΦPL) von 100±0.8 % und einer externen Quanteneffizienz (EQE) von 25.2 % in einer dotierten OLED.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201906575