Chromenopyrazole-based bipolar host materials for solution-processable thermally activated delayed fluorescence OLEDs exhibiting high efficiency and low roll-off?
Chemical Communications Pub Date: 2019-10-02 DOI: 10.1039/C9CC05983K
Abstract
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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Journal Name：Chemical Communications
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CAS no.: 89640-58-4
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