A multiresonant thermally activated delayed fluorescent dendrimer with intramolecular energy transfer: application for efficient host-free green solution-processed organic light-emitting diodes

Sen Wu, Dongyang Chen, Xiao-Hong Zhang*, Dianming Sun*, Eli Zysman-Colman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The development of narrowband emissive, bright, and stable solution-processed organic light-emitting diodes (SP-OLEDs) remains a challenge. Here, a strategy is presented that merges within a single emitter a TADF sensitizer responsible for exciton harvesting and an MR-TADF motif that provides bright and narrowband emission. This emitter design also shows strong resistance to aggregate formation and aggregation-cause quenching. It is based on a known MR-TADF emitter DtBuCzB with a donor-acceptor TADF moiety consisting of either tert-butylcarbazole donors (tBuCzCO2HDCzB) or second-generation carbazole-based donor dendrons (2GtBuCzCO2HDCzB) and a benzoate acceptor. The TADF moiety acts as an exciton harvesting antenna and transfers these excitons via Förster resonance energy transfer to the MR-TADF emissive core. The SP-OLEDs with 2GtBuCzCO2HDCzB and tBuCzCO2HDCzB thus show very high maximum external quantum efficiencies (EQEmax of 27.9 and 22.0%) and minimal efficiency roll-off out to 5000 cd m−2.
Original languageEnglish
Article number2415289
Number of pages12
JournalAdvanced Materials
VolumeEarly View
Early online date9 Jan 2025
DOIs
Publication statusE-pub ahead of print - 9 Jan 2025

Keywords

  • Dendrimer
  • Energy transfer
  • Multiresonant thermally activated delayed fluorescence
  • Solution-processed organic light-emitting diodes

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