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Red/Near-Infrared Thermally Activated Delayed Fluorescence OLEDs With Near 100 % Internal Quantum Efficiency

Red/Near-Infrared Thermally Activated Delayed Fluorescence OLEDs With Near 100 % Internal Quantum Efficiency

Jia-Xiong Chen, Wen-Wen Tao, Wen-Cheng Chen, Ya-Fang Xiao, Kai Wang, Chen Cao, Jia Yu, Shengliang Li, Feng-Xia Geng, Chihaya Adachi, Chun-Sing Lee, Xiao-Hong Zhang

Angew Chem Int Ed Engl. 2019 Oct 7;58(41):14660-14665.

PMID: 31313424

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR42418205	Fluorescent red NIR 680			Price

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