Li-containing α-sialon-based phosphor, production process thereof, lighting device and image display device

摘要

An Li-containing α-sialon-based phosphor represented by the formula (1): Li_xEu_ySi_12−(m+n)Al_(m+n)O_n+δN_16−n−δ (wherein assuming that average valence of Eu is a, x+ya+δ=m; 0.45≦x1.2, 0.001≦y≦0.2, 0.9≦m≦2.5, 0.5≦n≦2.4, and δ0).