Cited by 180Luminescence and Fluorescent MaterialsPhotochemistry and Electron Transfer StudiesOrganic Light-Emitting Diodes Research

Restriction of Access to the Dark State: A New Mechanistic Model for Heteroatom‐Containing AIE Systems

Open access
Tu, Yujie, Liu, Junkai, Zhang, Haoke, Peng, Qian, Lam, Jacky W. Y., Tang, Ben Zhong·2019·Angewandte Chemie International Edition

Published version of a preprint

Abstract

Restriction of intramolecular motion (RIM), as the working mechanism of aggregation‐induced emission (AIE), cannot fully explain some heteroatom‐containing systems. Now, two excited states are taken into account and a mechanism, restriction of access to dark state (RADS), is specified to elaborate RIM and complete the picture of AIE mechanism. A nitrogen‐containing molecule named APA is chosen as a model compound; its weak fluorescence in solution is ascribed to the easy access from the bright (π,π*) state to the close‐lying dark (n,π*) state. By either metal complexation or aggregation, the dark state is less accessible due to restriction of the molecular motion leading to the dark state and elevation of the dark state energy, thus the bright state emission is restored. RADS is powerful in elucidating the AIE effect of molecules with excited states favoring non‐radiative decay, including overlap‐forbidden states such as (n,π*) and CT states, spin‐forbidden triplet states, and so on.

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Registry

Crossref · 10.1002/anie.201907522

Cites

36 of 36 references verified0 citation errors · 0 not checkable

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Authors
Tu, Y., Liu, J., Zhang, H., Peng, Q., Lam, J. W. Y., & Tang, B. Z.
Affiliations
  • Hong Kong University of Science and Technology (HK)
  • Chinese Academy of Sciences (CN)
Corresponding author
Tang, Ben Zhong
Venue
Angewandte Chemie International Edition
Publisher
Wiley
Published
2019-08-27
Volume
58
Issue
42
Pages
14911-14914
ISSN
  • 1433-7851 (ISSN-L)
  • 1521-3773
OpenAlex
W2963690895
Cited by
180
References
36
Citations by year
2026: 9 · 2025: 19 · 2024: 26 · 2023: 18 · 2022: 43 · 2021: 23 · 2020: 35 · 2019: 7
FWCI
9.75
Type
journal article
Language
en
Open access
Locations
  • Angewandte Chemie International Edition (publishedVersion)
  • ChemRxiv (acceptedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Figshare (submittedVersion, cc-by-nc-nd)
  • Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
Funders
National Natural Science Foundation of China (21788102, 81501591)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Light-Emitting Diodes Research
Keywords
aggregation-induced emission, restriction of intramolecular motion, dark states, excited-state mechanism, metal complexation, aggregation, nonradiative decay, charge-transfer states, organonitrogen compounds

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