Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 11, Pages 3662-3666Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201510600
Keywords
amplification; FRET; nanoparticles; photochromism; photoswitching
Categories
Funding
- Agence Nationale de la Recherche (France)
- JSPS KAKENHI
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [24685021, 26107008]
- PHENICS network (CNRS GDRI)
- CNRS-JSPS program
- SAKURA program (JSPS-Campus France)
- ENS Cachan
- Grants-in-Aid for Scientific Research [24685021, 15K05464, 15H01076] Funding Source: KAKEN
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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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