Blue to near-IR energy transfer cascade within a dye-doped polymer matrix, mediated by a photochromic molecular switch

Physical Chemistry Chemical Physics : PCCP
Viktoras DryzaEvan J Bieske

Abstract

The spectroscopic properties of a poly(methyl methacrylate) matrix doped with a coumarin dye, a cyanine dye, and a photochromic spiropyran dye have been investigated. Before UV irradiation of the matrix, excitation of the coumarin dye results in minimal energy transfer to the cyanine dye. The energy transfer is substantially enhanced following UV irradiation of the matrix, which converts the colourless spiropyran isomer to the coloured merocyanine isomer, which then acts as an intermediate bridge by accepting energy from the coumarin dye and then donating energy to the cyanine dye. This demonstration of a switchable energy transfer cascade should help initiate new research directions in molecular photonics.

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Citations

Jul 20, 2017·Physical Chemistry Chemical Physics : PCCP·Chris RitchieViktoras Dryza
Feb 14, 2019·ACS Nano·Donald L KellisWilliam B Knowlton

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