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Eight Cd(ii) coordination polymers with persistent room-temperature phosphorescence: intriguing dual emission and time-resolved afterglow modulation

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Abstract

In this work, a new series of coordination polymers (CPs) 1–8 were designed and successfully synthesized; they displayed typical afterglow at room temperature under ambient conditions. In 1–4, single green phosphorescence was observed, where the T2 (π, π*) state was stabilized by the π-stacking interactions of the phosphorescent group tynca, which contributed to enhancing their luminescence lifetimes. In contrast, when the π-stacking interaction of the phosphorescent group tynca was absent in the rigid matrix, 5–8 exhibited an intriguing time-resolved afterglow modulation, in which yellow [T1 (n, π*), short lifetime] and green [T2 (π, π*), long lifetime] phosphorescences were sequentially observed during the decay process when the common UV light was turned off. As one of the representatives of long-lived dual phosphorescent CPs, the promising optical properties of 8 allowed it to be used in logos for advanced anti-counterfeiting systems. To the best of our knowledge, this special and rare afterglow modulation has not been reported in the literature for persistent RTP (p-RTP) CP systems, and further exploration in this area may open a new door for newly emerging technologies such as optical recording and encryption or multimodal bio-imaging.

Graphical abstract: Eight Cd(ii) coordination polymers with persistent room-temperature phosphorescence: intriguing dual emission and time-resolved afterglow modulation

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Supplementary files

Article information


Submitted
02 Oct 2019
Accepted
06 Dec 2019
First published
06 Dec 2019

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

Eight Cd(II) coordination polymers with persistent room-temperature phosphorescence: intriguing dual emission and time-resolved afterglow modulation

Y. Li, T. Gai, Y. Lin, W. Zhang, K. Li, Y. Liu, Y. Duan, B. Li, J. Ding and J. Li, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QI01273G

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