Optical model of light-converting film for white LED sources: Effect of distance between photoluminescent microparticles on specular reflectivity of exciting UV pump radiation

An optical model of a heterogeneous light-converting film based on YAG:Ce3+ phosphor in epoxy resin is developed. The dependence of the distance between phosphor microparticles on the mass fraction and densities of suspension components is determined. Reflection and transmission coefficients in isotropic scattering region are simulated. It is shown that optimization of the photoluminescent component significantly reduces specular reflection of UV pump radiation.