Giant Amplification of Photoswitching by a Few Photons in Fluorescent Photochromic Organic Nanoparticles |
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| Authors: | Dr Jia Su Prof Tuyoshi Fukaminato Dr Jean‐Pierre Placial Dr Tsunenobu Onodera Ryuju Suzuki Prof Hidetoshi Oikawa Arnaud Brosseau Dr François Brisset Dr Robert Pansu Prof Keitaro Nakatani Dr Rémi Métivier |
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| Affiliation: | 1. PPSM, ENS Cachan, CNRS, Université Paris-Saclay, Cachan, France;2. Dpt Appl. Chem. & Biochem., Kumamoto University, Chuo-ku, Kumamoto, Japan;3. Inst. of Multidisciplinary Res. for Adv. Materials, Tohoku University, Sendai, Japan;4. ICMMO, Paris-Sud University, CNRS, Université Paris-Saclay, Orsay, France |
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| Abstract: | 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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| Keywords: | amplification FRET nanoparticles photochromism photoswitching |
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