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• W3127796355 abstract "Organic room-temperature phosphorescence (RTP) materials with persistent RTP (PRTP) have attracted huge interest in inks, bioimaging, and photodynamic therapy. However, the design principle to increase the lifetime of organic molecules is underdeveloped. Herein, we show donor(D4)–acceptor(A) molecules (TOEPh, TOCPh, TOMPh, TOF and TOPh) with similar orientation of donor rings in aggregates that cause a large number of noncovalent interactions. We observed that TOEPh, TOCPh, TOMPh and TOF showed PRTP, whereas TOPh showed only phosphorescence emission (ΦP = ∼11%) with no PRTP property at ambient conditions. The spectroscopic and single-crystal X-ray analyses confirm the molecular assembly via J-aggregation with a face-to-face orientation of the donor rings. The crystal structure analysis (TOEPh, TOCPh, TOMPh, TOF) reveals that moderate π···π interactions (3.706 to 4.065 Å) between the donor rings cause the enhancement of the phosphorescence lifetime (26 to 245 ms), whereas the short phosphorescence lifetime (12 ms) of TOPh was observed because of the absence of π···π interactions. We found that TOEPh shows a long lifetime (245 ms) as compared to other derivatives because of the presence of ethoxy (−OEt) groups that enables spin–orbit coupling caused by strong lone pair (O)···π interactions present in the molecule. Utilizing the PRTP feature of TOEPh and the fluorescence emission of TOPh, we have shown data security applications in poly(methyl methacrylate)." @default.
• W3127796355 created "2021-02-15" @default.
• W3127796355 creator A5037744698 @default.
• W3127796355 creator A5060502094 @default.
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• W3127796355 date "2021-01-28" @default.
• W3127796355 modified "2023-10-15" @default.
• W3127796355 title "Effect of π···π Interactions of Donor Rings on Persistent Room-Temperature Phosphorescence in D₄–A Conjugates and Data Security Application" @default.
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• W3127796355 doi "https://doi.org/10.1021/acsomega.0c05666" @default.
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• W3127796355 hasPublicationYear "2021" @default.
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