Highly efficient blue, orange and red PhOLEDs with low roll-off of efficiency using a carbazole dendritic thermally activated delayed fluorescence (TADF) material as host

Highly efficient blue, orange and red PhOLEDs with low roll-off of efficiency using a carbazole dendritic thermally activated delayed fluorescence (TADF) material as host
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使用咔唑树枝状热激活延迟荧光 (TADF) 材料作为主体,具有低效率滚降的高效蓝色、橙色和红色 PhOLED

DOI:
10.1016/j.matlet.2018.08.154
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发表时间:
2018-12
期刊:
影响因子:
3
通讯作者:
Liu hengyan
Liu hengyan
中科院分区:
材料科学3区
文献类型:
--
作者:
王金山;姜翠凤;刘超;Liu hengyan

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在提高磷光有机发光二极管(PhOLEDs)器件效率方面已经做了大量的工作,但是抑制器件效率滚降的策略仍然是迫切需要的。本文提出了一种提高发光效率和抑制效率滚降的通用有效方法,即利用具有高三重态能(ET)的TADF材料作为蓝色、橙色和红色磷光掺杂剂的主体。在这项工作中,我们研究了这些基于新TADF宿主苯双(4-(3,3″,6,6″-四叔丁基-9 ' h -[9,3 ':6 ',9″- tercarbazole]-9 ' -yl)苯基)磷酸(TPPOCz)的聚合物的性能。基于TPPOCz主机的蓝色器件的效率为43.6 cd A−1和20.4%,CE和EQE的效率从峰值效率降至1000 cd m−2时的效率分别为2.1%和2.9%。我们将这些器件的性能与文献报道的性能进行了比较,并证实了这些器件在本工作中是最好的。这些结果可归因于快速的反向系统间交叉(RISC)过程和高三重态能量(ET)。这些优异的性能表明了TADF主机在未来实现高效稳定器件的潜力。
Numerous efforts have been devoted to improve the device efficiency of phosphorescent organic light-emitting diodes (PhOLEDs), however, strategies to suppress the device efficiency roll-off are still in urgent need. Here, a general and effective approach to boost the efficiency and suppress the efficiency roll-off of PhOLEDs is proposed, that is, utilizing TADF material with high triplet energy (ET) as the host for blue, orange and red phosphorescent dopants is proposed. In this work, we investigate the performance of these PhOLEDs based a new TADF host phenylbis(4-(3,3″,6,6″-tetra-tert-butyl-9′H-[9,3′:6′,9″-tercarbazol]-9′-yl)phenyl)phosphineoxide (TPPOCz). The blue device based on the TPPOCz host exhibit efficiencies of 43.6 cd A−1and 20.4%, and small efficiency roll-off of 2.1% and 2.9% for CE and EQE from the peak efficiencies to these at 1000 cd m−2. We compared the performances with that reported in literature, and confirmed these devices in this work are among the best of PhOLEDs. These results can be ascribed to the rapid reverse intersystem crossing (RISC) process and high triplet energy (ET). These excellent performances indicating the potential of TADF host for the realization of highly efficient and stable devices in future.
新型蓝色双极热激活延迟荧光材料作为具有稳定高显色指数的高效混合暖白 OLED 的主体发射器
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