Efficient Intramolecular Charge‐Transfer Fluorophores Based on Substituted Triphenylphosphine Donors

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...

Full description

Saved in:
Bibliographic Details
Published in:Angewandte Chemie 2021-06, Vol.133 (27), p.15176-15180
Main Authors: Liu, Zhang, Deng, Chao, Su, Liwu, Wang, Dan, Jiang, Yongshi, Tsuboi, Taiju, Zhang, Qisheng
Format: Article
Language:English
Subjects:
Charge transfer
Chemical compounds
Chemistry
Control equipment
Doped films
Emitters
Fluorescence
Fluorophores
intramolecular charge transfer
non-radiative decay
organic light emitting diodes
Phosphorescence
Photoluminescence
Photons
Steric hindrance
Substitutes
thermally activated delayed fluorescence
triphenylphosphine donor
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. Trivalent phosphorus is considered as new electron‐donating species for intramolecular charge transfer fluorophores. The efficient triphenylphosphine‐based emitters with excellent electrochemical stability and small singlet–triplet splitting afford potentials for luminescence‐based applications and devices.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.202103075