将 MR-TADF 发射器引入发光电化学电池以实现窄带高效发射,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

将 MR-TADF 发射器引入发光电化学电池以实现窄带高效发射
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-08-24 , DOI: 10.1002/adfm.202306170
Shi Tang ₁ , John Marques dos Santos ₂ , Joan Ràfols‐Ribé ₁ , Jia Wang ₁ , Eli Zysman‐Colman ₂ , Ludvig Edman ₁

Affiliation

通过多共振热激活延迟荧光（MR-TADF）过程发射的有机半导体可以提供窄带和高效的电致发光，同时可以用溶剂和无金属进行加工。这使得它们在可持续发光电化学电池 (LEC) 中用作发射器具有吸引力，但迄今为止还没有关于 LEC 装置窄带和高效 MR-TADF 发射的报道。在这里，这个问题通过仔细和系统的材料选择和器件开发得到解决。具体来说，作者表明，原型刚性平面咔唑基 MR-TADF 发射体的有害聚集趋势可以通过其分散到相容的咔唑基共混主体和离子液体电解质中来抑制，并且进一步证明这种活性材料的调节可实现所需的平衡 p 型和 n 型电化学掺杂、91% 的高固态光致发光量子产率以及 MR-TADF 客体发射极上的单线态和三线态捕获。将这种设计的无金属活性 MR-TADF 材料引入 LEC，采用空气稳定电极，可产生 500 cd m -2 的亮蓝色电致发光，其外^量子效率高达 3.8%，并显示出窄发射轮廓，半峰全宽为 31 nm。

"点击查看英文标题和摘要"

Introducing MR-TADF Emitters into Light-Emitting Electrochemical Cells for Narrowband and Efficient Emission

Organic semiconductors that emit by the process of multi-resonance thermally activated delayed fluorescence (MR-TADF) can deliver narrowband and efficient electroluminescence while being processable from solvents and metal-free. This renders them attractive for use as the emitter in sustainable light-emitting electrochemical cells (LECs), but so far reports of narrowband and efficient MR-TADF emission from LEC devices are absent. Here, this issue is addressed through careful and systematic material selection and device development. Specifically, the authors show that the detrimental aggregation tendency of an archetypal rigid and planar carbazole-based MR-TADF emitter can be inhibited by its dispersion into a compatible carbazole-based blend host and an ionic-liquid electrolyte, and it is further demonstrated that the tuning of this active material results in a desired balanced p- and n-type electrochemical doping, a high solid-state photoluminescence quantum yield of 91%, and singlet and triplet trapping on the MR-TADF guest emitter. The introduction of this designed metal-free active MR-TADF material into a LEC, employing air-stabile electrodes, results in bright blue electroluminescence of 500 cd m⁻², which is delivered at a high external quantum efficiency of 3.8% and shows a narrow emission profile with a full-width-at-half-maximum of 31 nm.

更新日期：2023-08-24

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南