Diffusion material, diffusion material evaluating method, blending method for fine particles in the diffusion material, and production method for the diffusion material

摘要

A diffusion material includes a prescribed scattering S(λ) of respective fine particles that are determined by Mie theory for all plural kinds of fine particles at a wavelength λ of an incident light. The diffusion material includes plural kinds of fine particles having different refractive indices, dispersed into a matrix. Each particle providing light intensity attenuating rate C(λ) in the diffusion material, and chromaticity variations &Dgr;x and &Dgr;y of the incident light. The diffusion power of the diffusion material by using determined chromaticity variations &Dgr;x and &Dgr;y; the diffusion material that is evaluated by this evaluation method and can emit illumination light free from wavelength unevenness. The diffusion material includes a blending the fine particles to provide the prescribed diffusion and uniform illumination.