Chromenopyrazole-based bipolar host materials for solution-processable thermally activated delayed fluorescence OLEDs exhibiting high efficiency and low roll-off
Literature Information
Mallesham Godumala, Jiwon Yoon, Chiho Lee, Ji-Eun Jeong, Sungnam Park, Han Young Woo, Min Ju Cho, Dong Hoon Choi
This study reports the design, synthesis, and characterization of two new bipolar host materials, DCzCP and TCzCP. Both materials were implemented as hosts by doping a known green thermally activated delayed fluorescent (TADF) emitter (t4CzIPN) in solution-processable OLEDs. DCzCP-based devices afford the best performance with the maximum external quantum efficiency (EQE) of 21.2%. Notably, the EQE was maintained at 20.7% and 19.7% at a practical luminance of 500 cd m−2 and 1000 cd m−2, respectively, demonstrating very small roll-off.
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