title: Giant Amplification of Photoswitching by a Few Photons in Fluorescent Photochromic Organic Nanoparticles.
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.
authors.affiliation: PPSM, ENS Cachan, CNRS, Université Paris-Saclay, 94235, Cachan, France.
authors.forename: Jia
authors.initials: J
authors.lastname: Su
authors.affiliation: Dpt Appl. Chem. & Biochem., Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan. tuyoshi@kumamoto-u.ac.jp.
authors.forename: Tuyoshi
authors.initials: T
authors.lastname: Fukaminato
authors.affiliation: PPSM, ENS Cachan, CNRS, Université Paris-Saclay, 94235, Cachan, France.
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Placial
authors.affiliation: Inst. of Multidisciplinary Res. for Adv. Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, Japan.
authors.forename: Tsunenobu
authors.initials: T
authors.lastname: Onodera
authors.affiliation: Inst. of Multidisciplinary Res. for Adv. Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, Japan.
authors.forename: Ryuju
authors.initials: R
authors.lastname: Suzuki
authors.affiliation: Inst. of Multidisciplinary Res. for Adv. Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, Japan.
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Oikawa
authors.affiliation: PPSM, ENS Cachan, CNRS, Université Paris-Saclay, 94235, Cachan, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Brosseau
authors.affiliation: ICMMO, Paris-Sud University, CNRS, Université Paris-Saclay, 91405, Orsay, France.
authors.forename: François
authors.initials: F
authors.lastname: Brisset
authors.affiliation: PPSM, ENS Cachan, CNRS, Université Paris-Saclay, 94235, Cachan, France.
authors.forename: Robert
authors.initials: R
authors.lastname: Pansu
authors.affiliation: PPSM, ENS Cachan, CNRS, Université Paris-Saclay, 94235, Cachan, France.
authors.forename: Keitaro
authors.initials: K
authors.lastname: Nakatani
authors.affiliation: PPSM, ENS Cachan, CNRS, Université Paris-Saclay, 94235, Cachan, France. metivier@ppsm.ens-cachan.fr.
authors.forename: Rémi
authors.identifier: http://orcid.org/0000-0001-5612-8327
authors.initials: R
authors.lastname: Métivier
keywords: FRET; amplification; nanoparticles; photochromism; photoswitching