Preparation and Luminescence Properties of Organic Phosphorescent Nanoparticles

Organic phosphorescent nanoparticles, which have a host–guest-type structure and show photosensitized phosphorescence, were successfully prepared by a reprecipitation method. Concentration quenching, which is disadvantage for organic nanophosphors, was efficiently suppressed with a host–guest-type structure widely used in organic light-emitting diodes. The study of luminescence properties revealed that the host material acts as a photosensitizer leading to the phosphorescence of the guest materials. Depending on the guest material, organic phosphorescent nanoparticles showed emission spectra of blue, green, and red. By adjusting the mixing ratio of phosphorescent nanoparticle dispersion liquids, the emission spectrum was tunable and white luminescence was observed.