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Efficient deep-blue luminescence based on dual-channel intra/intermolecular exciplexes.

Zhen ZhangDehai DouRongrong XiaPeng WuEduard SpulingKe WangJin CaoBin WeiXifeng LiJianhua ZhangStefan BräseZixing Wang
Published in: Science advances (2023)
Highly efficient and stable blue organic light-emitting diodes (OLEDs) cannot be easily obtained simultaneously. In particular, the efficiency roll-off as a reference index to evaluate the lifetime of deep-blue OLED at high luminescence is still severe. A novel molecule ( CzSiTrz ) connected with carbazole and triazine fragments by a nonconjugated silicon atom is designed. An intramolecular charge transfer emission and intermolecular exciplex luminescence in the aggregated state are obtained, resulting in a dual-channel intra/intermolecular exciplex ( DCIE ) emission with fast and efficient reverse intersystem crossing (RISC). Deep-blue OLED with Commission Internationale de l'Eclairage (CIE) coordinates of (0.157, 0.076) and a record-high external quantum efficiency (EQE) of 20.35% at high luminance (5000 cd m -2 ) is accomplished. Simple molecular synthesis and device fabrication of this strategy give a unique approach to realizing high-performance deep-blue electroluminescence.
Keyphrases
  • light emitting
  • energy transfer
  • highly efficient
  • quantum dots
  • molecular dynamics
  • solid state
  • drug induced