Patent ID: 11168251

Abstract:
A phosphor includes a crystal phase with a chemical composition (LuxY1-x)yM3-y-zCezβpγq. M denotes one or more elements selected from the group consisting of La, Sc, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb. β contains Si, which constitutes 90% or more by mole of β. γ contains N, which constitutes 90% or more by mole of γ. The variables x, y, z, p, and q satisfy 0<x≤1, 1.5≤y≤3−z, 0<z≤0.6, 5.5≤p≤6.5, and 10.5≤q≤11.5. The phosphor has an emission spectrum peak at a wavelength in the range of not less than 600 nm and not more than 680 nm.