当前位置: X-MOL 学术Chem. Sci. › 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.)
Carbazole-2-carbonitrile as an acceptor in deep-blue thermally activated delayed fluorescence emitters for narrowing charge-transfer emissions
Chemical Science ( IF 8.4 ) Pub Date : 2022-06-08 , DOI: 10.1039/d2sc02478k
Chin-Yiu Chan 1 , Yi-Ting Lee 1 , Masashi Mamada 1 , Kenichi Goushi 1 , Youichi Tsuchiya 1 , Hajime Nakanotani 1, 2 , Chihaya Adachi 1, 2
Affiliation  

This work reports a new acceptor for constructing donor–acceptor type (D–A type) blue thermally activated delayed fluorescence (TADF) emitters with narrowed charge-transfer (CT) emissions. A new acceptor core, carbazole-2-carbonitrile (CCN), is formed by the fusion of carbazole and benzonitrile. Three D–A type TADF emitters based on the CCN acceptor, namely 3CzCCN, 3MeCzCCN, and 3PhCzCCN, have been successfully synthesized and characterized. These emitters show deep-blue emissions from 439 to 457 nm with high photoluminescence quantum yields of up to 85% in degassed toluene solutions. Interestingly, all CCN-based deep-blue TADF emitters result in narrow CT emissions with full-width at half-maximums (FWHMs) of less than 50 nm in toluene solutions, which are pretty narrower compared with those of typical D–A type TADF emitters. Devices based on these emitters show high maximum external quantum efficiencies of up to 17.5%.

中文翻译:

咔唑-2-甲腈作为深蓝色热激活延迟荧光发射器中的受体,用于缩小电荷转移发射

这项工作报告了一种新的受体,用于构建具有窄电荷转移 (CT) 发射的供体-受体型 (D-A 型) 蓝色热激活延迟荧光 (TADF) 发射器。通过咔唑和苄腈的融合形成新的受体核心,咔唑-2-腈(CCN)。三种基于 CCN 受体的 D-A 型 TADF 发射器,即3CzCCN3MeCzCCN3PhCzCCN, 已成功合成和表征。这些发射器显示 439 至 457 nm 的深蓝色发射,在脱气的甲苯溶液中具有高达 85% 的高光致发光量子产率。有趣的是,所有基于 CCN 的深蓝色 TADF 发射器在甲苯溶液中都会产生窄的 CT 发射,其半峰全宽 (FWHM) 小于 50 nm,与典型的 D-A 型 TADF 相比要窄得多发射器。基于这些发射器的器件表现出高达 17.5% 的最大外部量子效率。
更新日期:2022-06-08
down
wechat
bug