Thermally activated delayed fluorescent small molecule sensitized fluorescent polymers with reduced concentration-quenching for efficient electroluminescence.

IF 4.1 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Frontiers of Optoelectronics Pub Date : 2023-03-21 DOI:10.1007/s12200-022-00056-x
Qin Xue, Mingfang Huo, Guohua Xie
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引用次数: 2

Abstract

Thermally activated delayed fluorescence (TADF) small molecule bis-[3-(9,9-dimethyl-9,10-dihydroacridine)-phenyl]-sulfone (m-ACSO2) was used as a universal host to sensitize three conventional fluorescent polymers for maximizing the electroluminescent performance. The excitons were utilized via inter-molecular energy transfer and the non-radiative decays were successfully refrained in the condensed states. Therefore, the significant enhancement of the electroluminescent efficiencies was demonstrated. For instance, after doping poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) into m-ACSO2, the external quantum efficiency (EQE) was improved by a factor of 17.0 in the solution-processed organic light-emitting device (OLED), as compared with the device with neat F8BT. In terms of the other well-known fluorescent polymers, i.e., poly (para-phenylene vinylene) copolymer (Super Yellow, SY) and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), their EQEs in the devices were respectively enhanced by 70% and 270%, compared with the reference devices based on the conventional host 1,3-di(9H-carbazol-9-yl) benzene (mCP). Besides the improved charge balance in the bipolar TADF host, these were partially ascribed to reduced fluorescence quenching in the mixed films.

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热激活延迟荧光小分子敏化荧光聚合物与降低浓度猝灭高效电致发光。
以热激活延迟荧光(TADF)小分子双-[3-(9,9-二甲基-9,10-二氢吖啶)-苯基]-砜(m-ACSO2)为通用载体,对三种传统荧光聚合物进行了致敏,使其电致发光性能最大化。激子通过分子间能量传递被利用,在凝聚态中成功地抑制了非辐射衰变。因此,电致发光效率得到了显著的提高。例如,在m-ACSO2中掺杂聚(9,9-二辛基芴-共苯并噻唑)(F8BT)后,溶液处理有机发光器件(OLED)的外量子效率(EQE)比纯F8BT器件提高了17.0倍。对于其他知名的荧光聚合物,即聚(对苯基乙烯)共聚物(超级黄,SY)和聚[2-甲氧基-5-(2-乙基己氧基)-1,4-苯基乙烯](MEH-PPV),与基于传统宿主1,3-二(9h -卡唑-9-基)苯(mCP)的参考装置相比,它们在装置中的EQEs分别提高了70%和270%。除了改善了双极性TADF主体中的电荷平衡外,这部分归因于混合膜中荧光猝灭的减少。
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来源期刊
Frontiers of Optoelectronics
Frontiers of Optoelectronics ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
7.80
自引率
0.00%
发文量
583
期刊介绍: Frontiers of Optoelectronics seeks to provide a multidisciplinary forum for a broad mix of peer-reviewed academic papers in order to promote rapid communication and exchange between researchers in China and abroad. It introduces and reflects significant achievements being made in the field of photonics or optoelectronics. The topics include, but are not limited to, semiconductor optoelectronics, nano-photonics, information photonics, energy photonics, ultrafast photonics, biomedical photonics, nonlinear photonics, fiber optics, laser and terahertz technology and intelligent photonics. The journal publishes reviews, research articles, letters, comments, special issues and so on. Frontiers of Optoelectronics especially encourages papers from new emerging and multidisciplinary areas, papers reflecting the international trends of research and development, and on special topics reporting progress made in the field of optoelectronics. All published papers will reflect the original thoughts of researchers and practitioners on basic theories, design and new technology in optoelectronics. Frontiers of Optoelectronics is strictly peer-reviewed and only accepts original submissions in English. It is a fully OA journal and the APCs are covered by Higher Education Press and Huazhong University of Science and Technology. ● Presents the latest developments in optoelectronics and optics ● Emphasizes the latest developments of new optoelectronic materials, devices, systems and applications ● Covers industrial photonics, information photonics, biomedical photonics, energy photonics, laser and terahertz technology, and more
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