Sulfone-Based Deep Blue Thermally Activated Delayed Fluorescence Emitters: Solution-Processed Organic Light-Emitting Diodes with High Efficiency and Brightness
作者:Nils Jürgensen、Andreas Kretzschmar、Stefan Höfle、Jan Freudenberg、Uwe H. F. Bunz、Gerardo Hernandez-Sosa
DOI:10.1021/acs.chemmater.7b02964
日期:2017.11.14
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
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,该对发射体采用对苯二甲酰(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小低至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。