Pure-blue single-layer organic light-emitting diodes based on trap-free hyperfluorescence.

ABSTRACT: Blue organic light-emitting diodes based on thermally activated delayed fluorescence suffer from low stability and broad emission. Hyperfluorescence-in which the excited state created on the thermally activated delayed fluorescence emitter is transferred to a fluorescent terminal emitter with a narrow emission spectrum-is promising towards improving colour purity and stability. However, direct charge trapping on the smaller-gap terminal emitter may lead to direct emissive losses, inhibited charge transport and charge imbalance. Here we demonstrate single-layer pure-blue hyperfluorescent organic light-emitting diodes that are not compromised by charge trapping on the terminal emitter. We reveal that the energetic disorder of the thermally activated delayed fluorescence sensitizer allows for

SUBMITTER: Sachnik O 

PROVIDER: S-EPMC12575368 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature