Xia Lan, Jiajie Zeng, Jinke Chen, Tao Yang, Xiaobing Dong, Ben Zhong Tang, Zujin Zhao
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They hold outstanding thermal stability with ultrahigh decomposition temperatures (556-563 oC), and exhibit fast delayed fluorescence and excellent photoluminescence quantum efficiencies (86%-97%). The regular and close stacking of acceptor and donors results in rigidified molecular structures with efficient through-space interaction, which are conducive to suppressing intramolecular motion and reducing reorganized excited-state energy. The organic light-emitting diodes (OLEDs) using them as emitters exhibit excellent electroluminescence performances, with maximum external quantum efficiencies of up to 30.6%, which is a leading value for the OLEDs based on folded TADF emitters. 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引用次数: 0
摘要
构建折叠分子结构正在成为开发高效热激活延迟荧光(TADF)材料的一种有前途的策略。大多数折叠 TADF 材料都具有 V 形构型,由连接在咔唑或芴桥上的供体和受体形成。本研究提出了一种探索夹层结构分子的简便分子设计策略,并以 11,12-二氢吲哚并[2,3-a]咔唑为桥,黄酮为受体,二苯并噻吩、二苯并呋喃、9-苯基咔唑和吲哚并[3,2,1-JK]咔唑为供体,构建了一系列具有规则 U 型夹层构象的新型、坚固的 TADF 材料。它们具有出色的热稳定性和超高的分解温度(556-563 oC),并表现出快速延迟荧光和出色的光量子效率(86%-97%)。受体和供体规则而紧密的堆叠形成了具有高效通空相互作用的刚性分子结构,有利于抑制分子内运动和降低重组激发态能量。用它们作为发光体的有机发光二极管(OLED)表现出优异的电致发光性能,最大外部量子效率高达 30.6%,在基于折叠 TADF 发光体的有机发光二极管中处于领先地位。这些结果表明,利用 11,12-二氢吲哚并[2,3-a]咔唑作为平面供体和受体的桥来构建高效折叠 TADF 材料的策略是可行的。
Constructing folded molecular structures is emerging as a promising strategy to develop efficient thermally activated delayed fluorescence (TADF) materials. Most folded TADF materials have V-shaped configurations formed by donors and acceptors linked on carbazole or fluorene bridges. In this work, a facile molecular design strategy is proposed for exploring sandwich-structured molecules, and a series of novel and robust TADF materials with regular U-shaped sandwich conformations are constructed by using 11,12-dihydroindolo[2,3-a]carbazole as bridge, xanthone as acceptor, and dibenzothiophene, dibenzofuran, 9-phenylcarbazole and indolo[3,2,1-JK]carbazole as donors. They hold outstanding thermal stability with ultrahigh decomposition temperatures (556-563 oC), and exhibit fast delayed fluorescence and excellent photoluminescence quantum efficiencies (86%-97%). The regular and close stacking of acceptor and donors results in rigidified molecular structures with efficient through-space interaction, which are conducive to suppressing intramolecular motion and reducing reorganized excited-state energy. The organic light-emitting diodes (OLEDs) using them as emitters exhibit excellent electroluminescence performances, with maximum external quantum efficiencies of up to 30.6%, which is a leading value for the OLEDs based on folded TADF emitters. These results demonstrate the proposed strategy of employing 11,12-dihydroindolo[2,3-a]carbazole as bridge for planar donors and acceptors to construct efficient folded TADF materials is applicable.
期刊介绍:
Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.