Fluorescent Nanoparticles of 2-Ethylanthracene and Pyrene

Abstract

Fluorescence behavior of nanoparticles of two aromatic compounds, 2-ethylanthracene and pyrene, was studied. Doped nanoparticles were also studied. Transparent organic nanoparticles dispersed in water were prepared by reprecipitation method. Polyvinyl alcohol was added in water to improve stability of organic nanoparticles. Fluorescence spectra and fluorescence quantum yields were measured by an absolute photoluminescence quantum yield measurement system. Fluorescence lifetimes were measured with a combination of a femtosecond Ti:sapphire laser and a streak camera. Fluorescence behavior of 2-ethylanthracene nanoparticles doped with naphthacene, pyrene nanoparticles doped with perylene, and polycrystals of 2-ethylanthracene and pyrene, was measured. Doping of nanoparticles with dopant quenched fluorescence of nanoparticles and strong fluorescence of dopant was observed. Fluorescence quantum yield of 2-ethylnaphthacene nanoparticles doped with naphthacene and that of pyrene nanoparticles doped with perylene were as high as 0.52 and 0.58, respectively.