Key requirements for ultraefficient sensitization in hyperfluorescence organic light-emitting diodes

Abstract Blue organic light-emitting diode (OLED) technology requires further advancements, and hyperfluorescent (HF) OLEDs have emerged as a promising solution to address stability and colour-purity concerns. A key factor influencing the performance of HF-OLEDs is Förster resonance energy transfer (FRET). Here we investigate the FRET mechanism in blue HF-OLEDs using contrasting thermally activated delayed fluorescence (TADF) sensitizers. We demonstrate that the molecular structure of the sensitizer profoundly impacts the FRET efficiency, exemplified by the spiro-linked TADF molecule ACRSA, which suppresses the dihedral-angle inhomogeneity and any lower-energy conformers that exhibit minimal FRET to the…

• EC
  European Commission

  Award: 812872
• H2
  Horizon 2020 Framework Programme

  Award: 812872
• EA
  Engineering and Physical Sciences Research Council

  Awards: EP/T02240X/1, EP/T02240X/1