Sandwich-type thermally activated delayed fluorescence molecules with through-space charge transfer excited state for red OLEDs

IF 2.7 4区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Organic Electronics Pub Date : 2024-08-08 DOI:10.1016/j.orgel.2024.107114

Peihao Chen , Chenglin Jiang , Nengquan Li , Xiu-Fang Song , Xintong Wan , He Liu , Jian-Gong Yang , Kai Li

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Abstract

Exploring through-space charge transfer (TSCT) excited state for the design of thermally activated delayed fluorescence (TADF) emitters has been receiving increasing interest for organic light-emitting diodes (OLEDs). In this work, we developed two TSCT-TADF molecules, namely 2DPXZ-QX and 2DPXZ-DFQX, which have sandwich-type donor-acceptor-donor (D-A-D) structures supported by two carbazole bridges. Dibenzo[a,c]phenazine (QX) and its fluorinated derivative (DFQX) were used as the acceptors and O-bridged triphenylamine (DPXZ) was used as the donor. The two donors and acceptor in each molecule are aligned in a face-to-face orientation and thus result in the presence of intramolecular π–π interactions, as revealed by their single crystal X-ray structures. The emission maxima (λ_PL) of 2DPXZ-QX and 2DPXZ-DFQX in doped 1,3-bis(N-carbazolyl)benzene films are 595 and 600 nm with photoluminescence quantum yields of 67 % and 54 %, respectively. The delayed fluorescence lifetimes are 8.8 and 6.7 μs. OLEDs based on the new sandwich-type emitters show maximum external quantum efficiencies of up to 19.1 %.

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用于红色有机发光二极管的具有穿透空间电荷转移激发态的夹层型热激活延迟荧光分子

为设计热激活延迟荧光（TADF）发射器而探索穿透空间电荷转移（TSCT）激发态，在有机发光二极管（OLED）领域受到越来越多的关注。在这项工作中，我们开发了两种 TSCT-TADF 分子，即 2DPXZ-QX 和 2DPXZ-DFQX，它们具有由两个咔唑桥支撑的夹心型供体-受体-供体（D-A-D）结构。二苯并[a,c]吩嗪（QX）及其氟化衍生物（DFQX）用作受体，O-桥接三苯胺（DPXZ）用作供体。单晶 X 射线结构显示，每个分子中的两个供体和受体以面对面的方向排列，因此存在分子内 π-π 相互作用。在掺杂的 1,3-双（N-咔唑基）苯薄膜中，2DPXZ-QX 和 2DPXZ-DFQX 的发射最大值（λPL）分别为 595 纳米和 600 纳米，光量子产率分别为 67% 和 54%。延迟荧光寿命分别为 8.8 和 6.7 μs。基于新型夹层型发光体的有机发光二极管的最大外部量子效率高达 19.1%。

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来源期刊

Organic Electronics 工程技术-材料科学：综合

CiteScore

6.60

自引率

6.20%

发文量

238

审稿时长

44 days

期刊介绍： Organic Electronics is a journal whose primary interdisciplinary focus is on materials and phenomena related to organic devices such as light emitting diodes, thin film transistors, photovoltaic cells, sensors, memories, etc. Papers suitable for publication in this journal cover such topics as photoconductive and electronic properties of organic materials, thin film structures and characterization in the context of organic devices, charge and exciton transport, organic electronic and optoelectronic devices.