Cited by 112Luminescence and Fluorescent MaterialsOrganic Light-Emitting Diodes ResearchPhotochemistry and Electron Transfer Studies

Highly efficient aggregation-induced red-emissive organic thermally activated delayed fluorescence materials with prolonged fluorescence lifetime for time-resolved luminescence bioimaging

Qi, Sujie, Kim, Sangin, Nguyen, Van-Nghia, Kim, Youngmee, Niu, Guangle, Kim, Gyoungmi, Kim, Sung-Jin, Park, Sungnam +1 more·2020·ACS Applied Materials & Interfaces

Abstract

Organic thermally activated delayed fluorescence (TADF) materials are emerging as potential candidates for time-resolved fluorescence imaging in biological systems. However, the development of purely organic TADF materials with bright aggregated-state emissions in the red/near-infrared (NIR) region remains challenging. Here, we report three donor–acceptor-type TADF molecules as promising candidates for time-resolved fluorescence imaging, which are engineered by direct connection of electron-donating moieties (phenoxazine or phenothiazine) and an electron-acceptor 1,8-naphthalimide (NI). Theoretically and experimentally, we elucidate that three TADF materials possessed remarkably small Δ E ST to promote the occurrence of reverse intersystem crossing (RISC). Moreover, they all exhibit aggregation-induced red emissions and long delayed fluorescence lifetimes without the influence of molecular oxygen. More importantly, these long-lived and biocompatible TADF materials, especially the phenoxazine-substituted NI fluorophores, show great potential for high-contrast fluorescence lifetime imaging in living cells. This study provides further a molecular design strategy for purely organic TADF materials and expands the versatile biological application of long-lived fluorescence research in time-resolved luminescence imaging.

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Crossref · 10.1021/acsami.0c15936

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  • Organic molecules with small HOMO and LUMO orbital overlaps have a small singlet-triplet energy gap (ΔEST) because of small exchange energy between them, thus making it easy to induce TADF.

    “Existing studies show that organic molecules with small HOMO and LUMO orbital overlaps have a small singlet-triplet energy gap (▵EST) because of small exchange energy between them, thus making it easy to induce TADF [38,39].”

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Authors
Qi, S., Kim, S., Nguyen, V.-N., Kim, Y., Niu, G., Kim, G., Kim, S.-J., Park, S., & Yoon, J.
Affiliations
  • Ewha Womans University (KR)
  • Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, Republic of Korea
  • Shandong University (CN)
  • Korea University (KR)
Corresponding author
  • Park, Sungnam
  • Yoon, Juyoung
Venue
ACS Applied Materials & Interfaces
Published
2020-11-06
Volume
12
Issue
46
Pages
51293-51301
ISSN
  • 1944-8244 (ISSN-L)
  • 1944-8252
OpenAlex
W3096899321
Cited by
112
References
45
Citations by year
2026: 13 · 2025: 16 · 2024: 27 · 2023: 17 · 2022: 17 · 2021: 22
FWCI
5.44
Type
journal article
Language
en
Open access
closed
Locations
  • ACS Applied Materials & Interfaces (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Research Foundation of Korea (2012R1A3A2048814, 2019R1A6A1A11044070, 2020R 1A 6C 101B194)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Light-Emitting Diodes Research
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
Keywords
thermally activated delayed fluorescence, aggregation-induced emission, time-resolved fluorescence imaging, fluorescence lifetime imaging, donor-acceptor molecules, phenoxazine, phenothiazines, 1,8-naphthalimide, reverse intersystem crossing, oxygen tolerance, live-cell imaging, molecular design
MeSH terms
Biocompatible Materials, Cell Survival, Fluorescent Dyes, HeLa Cells, Humans, Microscopy, Fluorescence, Oxazines, Quantum Theory, Spectrometry, Fluorescence, Temperature, Naphthalimides

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