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Sulfone-Based Deep Blue Thermally Activated Delayed Fluorescence Emitters: Solution-Processed Organic Light-Emitting Diodes with High Efficiency and Brightness
Chemistry of Materials ( IF 8.6 ) Pub Date : 2017-11-03 00:00:00 , DOI: 10.1021/acs.chemmater.7b02964
Nils Jürgensen 1, 2 , Andreas Kretzschmar 3 , Stefan Höfle 1 , Jan Freudenberg 2, 3 , Uwe H. F. Bunz 3, 4 , Gerardo Hernandez-Sosa 1, 2
Affiliation  

Low efficiencies of soluble blue emitter materials remain a major issue in the development of printed organic light-emitting devices. n-Alkylated carbazoles or sterically demanding ortho-substituted diphenylamines were employed as donor elements to increase solubility and to preserve blue emission of thermally activated delayed fluorescence (TADF) donor–acceptor–donor emitters employing a p-bis(phenylsulfonyl)benzene acceptor described in the literature. The soluble molecules exhibited increased steric hindrance of the amine donors and a small ΔEST as low as 0.32 eV. Thermally activated delayed fluorescence occurs, and photoluminescence quantum yields of ≤82% were achieved. Application of these TADF molecules in solution-processed organic light-emitting diodes resulted in high brightnesses of ≤10000 cd/m2, current efficiencies of ≤9.5 cd/A, and external quantum efficiencies of ≤8.5%, while retaining deep blue emission ranging from 466 to 436 nm with color coordinates low as CIEy = 0.08.

中文翻译:

基于砜的深蓝色热活化延迟荧光发射体:溶液处理的有机发光二极管,效率高且亮度高

可溶性蓝光发射器材料的低效率仍然是印刷有机发光器件开发中的主要问题。使用n-烷基咔唑或空间上要求严格的邻位取代的二苯胺作为供体元素,以增加溶解度并保留热活化延迟荧光(TADF)供体-受体-供体发射体的蓝光发射,其中使用了对-双(苯磺酰基)苯受体文献。可溶性分子对胺供体的位阻增加,ΔE ST低至0.32 eV。发生热激活的延迟荧光,并且实现了≤82%的光致发光量子产率。这些TADF分子在溶液处理的有机发光二极管中的应用导致≤10000cd / m 2的高亮度,≤9.5cd / A的电流效率和≤8.5%的外部量子效率,同时保持了深蓝色发射范围从466到436 nm,色坐标低至CIE y = 0.08。
更新日期:2017-11-03
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