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

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.
PMID: 31602441 [PubMed - as supplied by publisher]

Source: Chemical Communications - October 10, 2019 Category: Chemistry Authors: Godumala M, Yoon J, Lee C, Jeong JE, Park S, Woo HY, Cho MJ, Choi DH Tags: Chem Commun (Camb) Source Type: research