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Issue 11, 2018
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Waterborne polyurethanes prepared from benzophenone derivatives with delayed fluorescence and room-temperature phosphorescence

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Abstract

Dual-emissive materials with both fluorescence and room-temperature phosphorescence (RTP) are extensively used in bioimaging, sensors, and optoelectronics. Here, a series of N,N-substituted benzophenone-based waterborne polyurethanes (WPUs) were synthesized by a facile polycondensation reaction, which exhibit both delayed fluorescence (DF) and RTP emission utilizing strong intramolecular charge-transfer states (CT states) to serve as a bridge between singlet and triplet states. The basic structural and luminescent characterization is mainly investigated. With an increase in dye loadings, there is a progressive mergence between the singlet and triplet states, which can be explained by polymerization-enhancing intersystem crossing (PEX), a model based on Kasha's molecular exciton theory, leading to tunable fluorescence and RTP. As a result, by a rational design it could be a common method to develop single-component luminescent materials with both fluorescence and RTP.

Graphical abstract: Waterborne polyurethanes prepared from benzophenone derivatives with delayed fluorescence and room-temperature phosphorescence

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Publication details

The article was received on 27 Nov 2017, accepted on 11 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C7PY01995E
Citation: Polym. Chem., 2018,9, 1303-1308
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    Waterborne polyurethanes prepared from benzophenone derivatives with delayed fluorescence and room-temperature phosphorescence

    T. Wang, C. Zhou, X. Zhang and D. Xu, Polym. Chem., 2018, 9, 1303
    DOI: 10.1039/C7PY01995E

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