Patent ID: 8883039

Claim:
A lighting apparatus comprising: an emission source and a phosphor; wherein the phosphor comprises α-type sialon crystal which is expressed by a general formula: (Li x1 ,Eu x2 )(Si 12−(m+n) Al m+n )(O n N 16−n ), wherein x1 is an amount of solid solution of Li in a sialon unit cell, and x2 is an amount of solid solution of Eu in the sialon unit cell, wherein the parameters x1, x2, m, and n satisfy: 1.6 ≦x 1≦2.4 (1), 0.001 ≦x 2≦0.4 (2), 1.8 ≦m≦ 2.4 (14), and 0.8≦ n≦ 1.2 (15), wherein the α-type sialon crystal emits fluorescence with a peak in a wavelength region of from 550 nm to 575 nm upon irradiation of an excitation source.