BETA-SIALON FLUORESCENT MATERIAL, USES THEREOF, AND METHOD OF PRODUCING THE BETA-SIALON FLUORESCENT MATERIAL

摘要

The present invention provides a β-SiAlON phosphor that contains a β-SiAlON represented by a general formula Si_6-zAl_zO_zN_8-z (0z4.2) as a matrix and Eu²⁺ in a form of a solid solution as an emission center, and exhibits a peak within a wavelength range from 520 to 560 nm when excited by blue light. The average diffuse reflectance of this β-SiAlON phosphor in the wavelength range from 700 to 800 nm is 90% or higher, and the diffuse reflectance in the fluorescent peak wavelength is 85% or higher.