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Direct population of triplet excited states through singlet–triplet transition for visible-light excitable organic afterglow

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Abstract

Invoking efficient afterglow in metal-free organic molecules represents an important material advancement. However, organic afterglow suffers from low intensity and efficiency and generally needs to be excited by UV light owing to its spin-forbidden phosphorescent nature that essentially requires facile intersystem crossing (ISC). Here, we propose a strategy to bypass the traditional ISC through facilitating singlet–triplet transition to directly populate triplet excited states from the ground state by combining synergetic effects of both heavy/hetero-atom incorporation and aromatic aggregation. Verified by systematic experimental and computational investigations, this unique singlet-to-triplet absorption results in a much improved organic afterglow quantum efficiency up to 9.5% with a prolonged lifetime of 0.25 s under visible-light irradiation. Fundamentally, this work illustrates for the first time the great potential of the direct population method to red-shift the excitation wavelength and improve the afterglow efficiency, offering important clues for the development of triplet-state involved organic optoelectronic technologies.

Graphical abstract: Direct population of triplet excited states through singlet–triplet transition for visible-light excitable organic afterglow

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Publication details

The article was received on 21 Nov 2018, accepted on 08 Apr 2019 and first published on 09 Apr 2019


Article type: Edge Article
DOI: 10.1039/C8SC05198D
Citation: Chem. Sci., 2019, Advance Article
  • Open access: Creative Commons BY license
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    Direct population of triplet excited states through singlet–triplet transition for visible-light excitable organic afterglow

    J. Yuan, R. Chen, X. Tang, Y. Tao, S. Xu, L. Jin, C. Chen, X. Zhou, C. Zheng and W. Huang, Chem. Sci., 2019, Advance Article , DOI: 10.1039/C8SC05198D

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