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Enhanced upconversion emission in air using novel stretched poly(vinyl alcohol) thin films

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Abstract

Dense chromophore systems have been proposed as an alternative approach to creating solid-state triplet–triplet annihilation upconversion (TTA-UC) materials. In order to extend this system to polymer-based TTA-UC materials, a new method for the in situ preparation of dense chromophore systems in poly(vinyl alcohol) (PVA) was developed using a mechanical stretching technique. The chromophores used in this study were newly synthesised to dissolve homogeneously in a PVA aqueous solution. These chromophores exhibited a blue upconverted emission in MeOH solution upon excitation with a 532 nm green laser. Remarkably, a clear upconversion emission was observed from the chromophore-blended PVA films even under ambient conditions after the stretching process. In addition, a correlation between the elongation length of the films and the ratio of UC emission/phosphorescence was clearly observed. The stretching process made the chromophores more condensed in the oriented and cross-linked polymer chains, thereby creating favourable conditions for triplet–triplet annihilation.

Graphical abstract: Enhanced upconversion emission in air using novel stretched poly(vinyl alcohol) thin films

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Publication details

The article was received on 29 Jun 2018, accepted on 31 Aug 2018 and first published on 03 Sep 2018


Article type: Paper
DOI: 10.1039/C8ME00041G
Citation: Mol. Syst. Des. Eng., 2018, Advance Article
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    Enhanced upconversion emission in air using novel stretched poly(vinyl alcohol) thin films

    T. Mori, T. Mori, A. Saito, H. Koishi, C. Nakamoto, A. Fujii and H. Saomoto, Mol. Syst. Des. Eng., 2018, Advance Article , DOI: 10.1039/C8ME00041G

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