کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5144250 | 1496815 | 2017 | 8 صفحه PDF | دانلود رایگان |
- We designed and synthesized two dendrimers TA-Cz and TA-3Cz with TADF characteristics.
- The introduction of the phenyl bridge is a promising route to simultaneously achieve small ÎEST and enhanced PLQYs.
- Our results here provide a facile strategy to obtain highly efficient non-doped solution-processed OLEDs.
We designed and synthesized two dendrimers TA-Cz and TA-3Cz with TADF characteristics by using non-conjugated aliphatic chains carbazole/tricarbazole as peripheral dendrons. Both dendrimers possess excellent thermal and morphological stabilities. Introduced the phenyl bridge to increase the distance of the emission core TA between donor (D) and acceptor (A) is a promising route to simultaneously achieve small singlet-triplet energy splitting (ÎEST) and enhanced PL quantum yields (PLQYs). Furthermore, non-conjugated aliphatic chains carbazole/tricarbazole dendrons were conveniently introduced to the TADF core, which can effective encapsulate the emission core to restrain the concentration quenching effect and make the fluorescence of the core independent. By utilizing TA-3Cz emitter as the non-doped solution-processed emissive layers, the resulting yellow OLED achieved low driving voltage of 2.4Â V and superior external quantum efficiency of 11.8%. Thus, our results here provide a facile strategy to obtain highly efficient non-doped solution-processed OLEDs by employing the reasonable molecular design of the TADF core and the utilization of flexible alkyl chain.
Our researches present a judicious design strategy for highly efficient non-doped solution-processable TADF emitters by employing the reasonable molecular design of the TADF core and the utilization of flexible alkyl chain.205
Journal: Organic Electronics - Volume 42, March 2017, Pages 123-130