(Invited) Fabrication and Characterization of Transparent Fluorescence Nanocomposite Film Containing Inorganic Phosphor Nanoparticles

Abstract

Nano-sized inorganic phosphors possess good photostability and thermal stability as compared with organic dyes and metal complexes. They exhibit high transparency due to low light scattering intensity in the visible region. A transparent fluorescence film of phosphor nanoparticles with a function of conversion from near UV light to visible light are therefore suitable candidates for applications to spectral down-shifters in white LEDs and photovoltaic devices. To fabricate the transparent nanocomposite film, the phosphor nanoparticles must be well-dispersed without their aggregation because light scattering intensity is proportional to the sixth power of a particle diameter according to Rayleigh’s theory. Nanoparticles aggregate easily in a solution due to their high surface energy. To solve this problem, we use electrostatic repulsion between charged nanoparticle surfaces. In this presentation, we discuss fabrication and characterization of transparent fluorescence nanocomposite films containing phosphor nanoparticles in a matrix.