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Emission Mechanism Understanding and Tunable Persistent Room Temperature Phosphorescence of Amorphous Nonaromatic Polymers

Abstract

Deciphering the emission mechanism of nonconventional luminogens and achieving persistent room temperature phosphorescence (p-RTP) from pure organic compounds have drawn increasing attention due to their significant fundamental importance and promising applications. Previous reports on nonconventional luminogens, however, mainly focus on fluorescence, while the advancements on pure organic p-RTP are generally restricted in aromatic crystals or host-guest systems. Herein, we report the unique intrinsic emission and moreover p-RTP in amorphous nonaromatic polymers of poly(acrylic acid) (PAA), polyacrylamide (PAM) and poly(N-isopropylacrylamide) (PNIPAM). They are nonluminescent in dilute solutions, while being highly emissive in concentrated solutions, nanosuspensions and solid powders/films, which can well be rationalized by the clustering-triggered emission (CTE) mechanism, as supported by further thermoresponsive emission, cryogenic and AIE experiments, alongside with single crystal analysis. Furthermore, PAA and PAM solids at ambient conditions, and PNIPAM solids in vacuum or under nitrogen, demonstrate distinct p-RTP, which can be enhanced through further ionization or pressurization. These results not only refresh our understanding on the emission mechanism of nonaromatic polymers, but also enable the facile fabrication and application of pure organic p-RTP luminogens from readily available compounds, thus providing an important step forward in both nonconventional luminogens and p-RTP.

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Publication details

The article was received on 16 Oct 2018, accepted on 30 Nov 2018 and first published on 04 Dec 2018


Article type: Research Article
DOI: 10.1039/C8QM00528A
Citation: Mater. Chem. Front., 2018, Accepted Manuscript
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    Emission Mechanism Understanding and Tunable Persistent Room Temperature Phosphorescence of Amorphous Nonaromatic Polymers

    Q. Zhou, Z. Wang, X. Dou, Y. Wang, S. Liu, Y. Zhang and W. Z. Yuan, Mater. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QM00528A

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