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Giant Amplification of Photoswitching by a Few Photons in Fluorescent Photochromic Organic Nanoparticles

Su, J; Fukaminato, T; Placial, JP; Onodera, T; Suzuki, R; Oikawa, H; Brosseau, A; Brisset, F; Pansu, R; Nakatani, K; Metivier, R ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 2016, 55, 3662-3666.

Controlling or switching the optical signal from a large collection of molecules with the minimum of photons represents an extremely attractive concept. Promising fundamental and practical applications may be derived from such a photon-saving principle. With this aim in mind, we have prepared fluorescent photochromic organic nanoparticles (NPs), showing bright red emission, complete ON-OFF contrast with full reversibility, and excellent fatigue resistance. Most interestingly, upon successive UV and visible light irradiation, the NPs exhibit a complete fluorescence quenching and recovery at very low photochromic conversion levels (<5%), leading to the fluorescence photoswitching of 420 +/- 20 molecules for only one converted photochromic molecule. This giant amplification of fluorescence photoswitching originates from efficient intermolecular energy-transfer processes within the NPs.

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Publication

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Paru le 28 janvier 2016

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DOI: 10.1002/anie.201510600