Sweet spot of energy-level alignment in hyperfluorescent organic light-emitting diodes

Rishabh Saxena, Giacomo Cotelli, Kleitos Stavrou, Engin Torun, Larissa G. Franca, Andrew P. Monkman, Stefano Gottardi and Anna Köhler

We investigate loss mechanisms in hyperfluorescent organic light-emitting diodes (HF-OLEDs) with the emissive layer consisting of a host, a thermally activated delayed fluorescence (TADF) sensitizer, and a terminal emitter. We focus on understanding how the relative energy levels between the TADF sensitizer and terminal emitter impact device efficiency and roll-off through the formation and subsequent […]