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Efficient Intramolecular Charge‐Transfer Fluorophores Based on Substituted Triphenylphosphine Donors
Author(s) -
Liu Zhang,
Deng Chao,
Su Liwu,
Wang Dan,
Jiang Yongshi,
Tsuboi Taiju,
Zhang Qisheng
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202103075
Subject(s) - phosphorescence , photochemistry , intramolecular force , quantum yield , photoluminescence , moiety , chemistry , excited state , electroluminescence , singlet state , fluorescence , steric effects , luminescence , phosphorescent organic light emitting diode , materials science , optoelectronics , stereochemistry , organic chemistry , atomic physics , optics , physics , layer (electronics)
Abstract Triphenylphosphine (TPP)‐based luminescent compounds are rarely investigated because of the low photoluminescence quantum yield (PLQY). Here, we demonstrate that introducing steric hindrance groups to the TPP moiety and separating the orbitals involved in the transition can drastically suppress the non‐radiative decay induced by structural distortion of TPP in the excited state. High PLQY up to 0.89 as well as thermally activated delayed fluorescence are observed from the intramolecular charge‐transfer (ICT) molecules with substituted TPP donors (sTPPs) in doped films. The red organic light‐emitting diodes employing these emitters achieve comparable external quantum efficiencies to the control device containing a classical phosphorescent dye, revealing the great potential of the ICT emitters based on electrochemically stable sTPPs.