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

Jia Su, Tuyoshi Fukaminato, Jean Pierre Placial, Tsunenobu Onodera, Ryuju Suzuki, Hidetoshi Oikawa, Arnaud Brosseau, François Brisset, Robert Pansu, Keitaro Nakatani, Rémi Métivier

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)3662-3666
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number11
Publication statusPublished - 2016 Jan 28
Externally publishedYes


  • FRET
  • amplification
  • nanoparticles
  • photochromism
  • photoswitching

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)


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