期刊
CHEMICAL SCIENCE
卷 10, 期 19, 页码 5031-5038出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sc05198d
关键词
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资金
- National Natural Science Foundation of China [21304049, 21674049, 21703077]
- Science Fund for Distinguished Young Scholars of Jiangsu Province of China [BK20150041]
- Six Talent Plan of Jiangsu Province [2016XCL050]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [46030CX17750]
- 1311 Talents Program of Nanjing University of Posts and Telecommunications (Dingshan)
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.
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