Patent ID: 7854859
Filing Date: 2010-12-21
Classification: C09K,H01L,H05B

Abstract:
1. A nitride phosphor that is activated by europium, and absorbs light from the near ultraviolet range to the blue range to emit red light, the nitride phosphor having the following general formula, where M is at least one element selected from the group consisting of Mg, Ca, Sr and Ba, wherein w, x, y and z fall within the following ranges 0.056≦w≦9, x=1, 0.056≦y≦18, and 0.0005≦z≦0.5 and wherein the mole concentration ratios of Fe, Ni, Cr, Ti, Nb, Sm and Yb are not more than 0.01 relative to the mole concentration of M.