Molecular conformation modulating luminescence switching between delayed fluorescence and room-temperature phosphorescence

doi:10.1039/d1tc02265b

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	Molecular conformation modulating luminescence switching between delayed fluorescence and room-temperature phosphorescence
	Y. Wen; S. Xiao; H. Liu; X. Tian; J. De; T. Lu; Z. Yang; D. Zou; Y. Lv; S.-T. Zhang; Q. Su and B. Yang
	2021
发表期刊	Journal of Materials Chemistry C
ISSN	20507534
卷号	9 期号:48 页码:17511-17517
摘要	A new pure organic donor-acceptor molecule, (4-chlorophenyl)(5H-dibenzo[b,f]azepin-5-yl)methanone (IS-CBZ), was designed and synthesized, which demonstrates near ultraviolet (NUV) delayed fluorescence (DF) and dual emission of NUV DF and yellow room-temperature phosphorescence (RTP) in two crystals (B-crystal and Y-crystal), respectively. These two kinds of luminescence (DF and RTP) can be reversibly switched by external stimuli, such as grinding and heating/fuming, accompanied by reversible phase transition between two crystalline states. The experimental and theoretical studies reveal that this switchable luminescence between DF and RTP originates from a single-molecule conformational change in different molecular packings, mainly involving the twist angle () between the donor and acceptor units. Thisfundamentally modulates the energy difference between the lowest singlet state (S1) and the high-lying triplet state (T2), ES1-T2, which determines the luminescence switching between DF and RTP. This work not only provides a new donor-acceptor architecture for pure organic multifunctional materials with mechanochromic luminescence (MCL) and mechanoluminescence (ML) properties, but also suggests a novel strategy to design stimuli-responsive materials with a unique luminescence switching between DF and RTP by tuning T2 The Royal Society of Chemistry 2021.
DOI	10.1039/d1tc02265b
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收录类别	SCI ; EI
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/65432
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Y. Wen,S. Xiao,H. Liu,et al. Molecular conformation modulating luminescence switching between delayed fluorescence and room-temperature phosphorescence[J]. Journal of Materials Chemistry C,2021,9(48):17511-17517.
APA	Y. Wen.,S. Xiao.,H. Liu.,X. Tian.,J. De.,...&Q. Su and B. Yang.(2021).Molecular conformation modulating luminescence switching between delayed fluorescence and room-temperature phosphorescence.Journal of Materials Chemistry C,9(48),17511-17517.
MLA	Y. Wen,et al."Molecular conformation modulating luminescence switching between delayed fluorescence and room-temperature phosphorescence".Journal of Materials Chemistry C 9.48(2021):17511-17517.

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