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Hybridized local and charge-transfer excited state fluorophores enabling organic light-emitting diodes with record high efficiencies close to 20.

Tiantian LiuXiaojie ChenJuan ZhaoWeichun WeiZhu MaoWilliam WuShibo JiaoYang LiuZhiyong YangZhenguo Chi
Published in: Chemical science (2021)
Pure organic emitters with full utilization of triplet excitons are in high demand for organic light-emitting diodes (OLEDs). Herein, through modulation of electron donors and introduction of phenyl rings as π spacers, we present three pure organic fluorophores (BCz, BTCz and BPTCz) with the hybridized local and charge-transfer (HLCT) excited state feature for OLED fabrication. Importantly, the introduction of π spacers in BPTCz not only enhances locally excited character with a fast radiative decay but also promotes intermolecular interactions to suppress non-radiative decays, contributing to a high solid-state fluorescence efficiency over 90%. Significantly, BPTCz not only endows its doped OLEDs with an external quantum efficiency (EQE) up to 19.5%, but also its non-doped OLED with a high EQE of 17.8%, and these outstanding efficiencies are the state-of-the-art performances of HLCT-based OLEDs.
Keyphrases
  • energy transfer
  • solid state
  • quantum dots
  • water soluble
  • machine learning
  • highly efficient
  • molecular dynamics
  • single molecule
  • low cost
  • tissue engineering