De novo design of single white-emitting polymers based on one chromophore with multi-excited states
De novo design of single white-emitting polymers based on one chromophore with multi-excited states
复制标题
基于具有多激发态的一种发色团的单一白光发射聚合物的从头设计
DOI：
10.1016/j.cej.2022.137004
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发表时间：
2022-05-24
影响因子：
15.1
通讯作者：
Wang, Lixiang
中科院分区：
文献类型：
--
作者：
Mei, Dengfeng;Yan, Libing;Wang, Lixiang
Single white-emitting polymers (SWPs) based on multi-chromophores with different colors are believed to show a great potential in solution-processed white light-emitting diodes (WOLEDs). However, they suffer from the extremely low loadings (one ten thousandth to one thousandth) for long-wavelength chromophores when incorporated into SWPs. To solve this bottleneck, we newly propose a one chromophore with multi-excited states strategy for the de novo design of SWPs. By adopting acridine as the donor (D), dibenzothiophene-S,S-dioxide as the acceptor (A) and oxygen as the linker between D and A to constitute the central chromophore fragment, P (DMPAc-O-DBTDO) is successfully developed to possess not only fluorescence and thermally-activated delayed fluorescence from the lowest singlet state (S1), but also room-temperature phosphorescence from the lowest triplet state (T1). As a consequence, a very broad electroluminescence that covers the whole visible region from 400 to 750 nm is realized, leading to an efficient and stable white light with a peak power efficiency of 7.5 lm W-1 (9.5 cd A-1, 3.7%). Meanwhile, the Commission Internationale de l'Eclairage (CIE) coordinates and correlated color temperature (CCT) could be well tuned in a wide doping concentration window (15-100%) for different illumination requirements.
