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Enhanced Emission and Its Switching in Fluorescent Organic Nanoparticles
December 2002
December 2002
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Abstract
A new class of organic nanoparticles (CN-MBE nanoparticles) with a mean diameter of
ca. 30-40 nm, which exhibit a strongly enhanced fluorescence emission, were prepared
by a simple reprecipitation method. CN-MBE (1-cyano-trans-1,2-bis-(4'-methylbiphenyl)ethylene)
is very weakly fluorescent in solution, but the intensity is increased by almost 700
times in the nanoparticles. Enhanced emission in CN-MBE nanoparticles is attributed
to the synergetic effect of intramolecular planarization and J-type aggregate formation
(restricted excimer formation) in nanopaticles. On/off fluorescence switching for
organic vapor was demonstrated with CN-MBE nanoparticles.