Excited state managing molecular design platform of blue thermally activated delayed fluorescence emitters by pi linker engineering
Journal
Journal of Materials Chemistry C
Date
2020.01.02
Abstract
A molecular design platform of blue thermally activated delayed fluorescence (TADF) emitters to boost the external quantum efficiency and efficiency roll-off of the blue TADF organic light-emitting diodes (OLEDs) was developed. A molecular structure hiring one or two excited state controlling sub units in the ？pi-linker between a donor and an acceptor was employed. The sub unit in the pi linker was a phenyl unit to precisely control the device performances of the TADF devices. It was described that the phenyl sub unit simultaneously improved the external quantum efficiency and efficiency roll-off of the TADF OLEDs. A high external quantum efficiency of 28.5％ was demonstrated using the material design having two phenyl sub units.