Optical Properties of 1-Phenyl-3-Naphthyl-5-((Ethoxy)phenyl)-2-Pyrazoline Organic Nanoparticlesby Reprecipitation Method.

Nanoparticles of 1-phenyl-3-naphthyl-5-((ethoxy)phenyl)-2-pyrazoline with sizes ranging from tens to hundreds of nanometers were prepared by the reprecipitation method. Their excitonic transitions responsible for absorption and emission, as compared with those of diluted solution, have been investigated as a function of nanoparticle size. We found that pyrazoline nanoparticles possess an ambiguous size dependence on their optical properties. As the nanoparticle size decreased, the absorption peak of pyrazoline nanoparticles was observed to be shifted to the high-energy side due to size effect. [ABSTRACT FROM AUTHOR]