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. 2019 Oct 24;55(86):12952-12955.
doi: 10.1039/c9cc05983k.

Chromenopyrazole-based bipolar host materials for solution-processable thermally activated delayed fluorescence OLEDs exhibiting high efficiency and low roll-off

Mallesham Godumala  1 , Jiwon Yoon  1 , Chiho Lee  1 , Ji-Eun Jeong  1 , Sungnam Park  1 , Han Young Woo  1 , Min Ju Cho  1 , Dong Hoon Choi  1
Affiliations

Chromenopyrazole-based bipolar host materials for solution-processable thermally activated delayed fluorescence OLEDs exhibiting high efficiency and low roll-off

Mallesham Godumala et al. Chem Commun (Camb). .

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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