Fluorescence modulation and non-destructive fluorescence readout based on the cooperative orientation of a fluorescent dye in an azobenzene liquid crystalline polymer film

Tsuyoshi Fukaminato; Tomoe Kato; Sunnam Kim; Seiji Kurihara

doi:10.1117/12.2531352

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30 August 2019 Fluorescence modulation and non-destructive fluorescence readout based on the cooperative orientation of a fluorescent dye in an azobenzene liquid crystalline polymer film

Tsuyoshi Fukaminato, Tomoe Kato, Sunnam Kim, Seiji Kurihara

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Proceedings Volume 11098, Molecular and Nano Machines II; 1109806 (2019) https://doi.org/10.1117/12.2531352
Event: SPIE Organic Photonics + Electronics, 2019, San Diego, California, United States

Abstract

We have developed several fluorescence photoswitchable molecules based on a photochromic energy transfer or electron transfer process and successfully demonstrated reversible fluorescence photoswitching with non-destructive readout capability even at the single-molecule level. In this study, as a novel method to achieve reversible fluorescence photoswitching and non-destructive fluorescence readout, we focused on the stimuli-responsive orientation behavior of a liquid crystalline polymer (LCP) containing a photochromic azobenzene unit. We attempted to cooperatively control the molecular orientation of a fluorescent dye by incorporating into an azobenzene LCP (PMAz6Ac) film and reversibly switch the fluorescence intensity along with the orientation change of PMAz6Ac induced by the polarized-light irradiation or thermal annealing process. We successfully observed cooperative orientation behavior of a doped fluorescent dye along with the orientation change of PMAz6Ac by choosing an appropriate fluorescent dye. This cooperative orientation allows us to demonstrate the reversible modulation of fluorescence intensity with non-destructive readout under irradiation with the polarized excitation light.

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Tsuyoshi Fukaminato, Tomoe Kato, Sunnam Kim, and Seiji Kurihara "Fluorescence modulation and non-destructive fluorescence readout based on the cooperative orientation of a fluorescent dye in an azobenzene liquid crystalline polymer film", Proc. SPIE 11098, Molecular and Nano Machines II, 1109806 (30 August 2019); https://doi.org/10.1117/12.2531352

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