Highly efficient and bright blue organic light-emitting devices based on solvent engineered, solution-processed thermally activated delayed fluorescent emission layer

Abstract

In this work, we use an efficient blue TADF emitter, bis [4-(9,9-dimethyl-9,10-dihydroacridine) phenyl]solfone (DMAC-DPS), as EML and propose a solvent engineering strategy to achieve high efficiency and brightness. The strategy employs synergetic solvents to improve the film morphology of the solution-processed DMAC-DPS EML. The improved film quality enhances the carrier injectionwhile reduces the surface trap charges, as revealed by the hole-/ electron-only device performance and the transient electroluminescence measurements.