Benzimidazobenzothiazole-Based Bipolar Hosts to Harvest Nearly All of the Excitons from Blue Delayed Fluorescence and Phosphorescent Organic Light-Emitting Diodes
Benzimidazobenzothiazole-Based Bipolar Hosts to Harvest Nearly All of the Excitons from Blue Delayed Fluorescence and Phosphorescent Organic Light-Emitting Diodes
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DOI：
10.1002/anie.201601136
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发表时间：
2016-06-06
影响因子：
16.6
通讯作者：
Adachi, Chihaya
中科院分区：
文献类型：
--
作者：
Cui, Lin-Song;Kim, Jong Uk;Adachi, Chihaya
许多努力致力于开发通过磷光或热激活延迟荧光（TADF）起作用的高效有机发光二极管（OLED）。然而，用于蓝色TADF和磷光客体发光体的有效主体材料受到限制，因为它们需要高的三重态能级。在此，我们报告了刚性受体单元苯并咪唑苯并噻唑（BID-BT），这是适用于在蓝色OLED的双极主机。所设计的主体材料，基于BID-BT，具有高的三重态能量和双极载流子输运能力。包含基于BID-BT的衍生物的蓝色TADF和磷光OLED都表现出高达20%的外量子效率，表明这些主体允许适合于蓝色TADF和磷光客体发光体的有效三重态激子限制。
Much effort has been devoted to developing highly efficient organic light-emitting diodes (OLEDs) that function through phosphorescence or thermally activated delayed fluorescence (TADF). However, efficient host materials for blue TADF and phosphorescent guest emitters are limited because of their requirement of high triplet energy levels. Herein, we report the rigid acceptor unit benzimidazobenzothiazole (BID-BT), which is suitable for use in bipolar hosts in blue OLEDs. The designed host materials, based on BID-BT, possess high triplet energy and bipolar carrier transport ability. Both blue TADF and phosphorescent OLEDs containing BID-BT-based derivatives exhibit external quantum efficiencies as high as 20%, indicating that these hosts allow efficient triplet exciton confinement appropriate for blue TADF and phosphorescent guest emitters.