β-type sialon, manufacturing method thereof, and light emitting device using the same

摘要

A β-type sialon in which Eu 2+ is dissolved in a β-type sialon represented by Si 6 -zAlzOzN8-z, the composition z is 0.3 or more and 1.5 or less, and the fluorescence spectrum when excited with light having a wavelength of 450 nm The peak wavelength is 545 n or more and 560 nm or less, the half width is 55 nm or more, and the external quantum efficiency is 45% or more. One or more oxides selected from aluminum oxide and silicon oxide, silicon nitride, and aluminum nitride are blended so that the z value is 0.3 or more and 1.5 or less, and a europium compound and an average particle It can be manufactured by adding a certain amount of β-sialon powder having a diameter of 5 μm or more and an average circularity of 0.7 or more and sintering.