Patent ID: 6833086
Filing Date: 2004-12-21
Classification: C09K,Y10T

Abstract:
A phosphor powder comprising (A) a host material, (B) an activator and (C) a co-activator,wherein the host material is constituted of zinc and sulfur, the activator is constituted of silver or copper, and the co-activator is constituted of aluminum, wherein the amount ratio of the activator to the host material is 1Ã—10âˆ’4 to 1Ã—10âˆ’3 parts by weight when the amount ratio of the host material is 1 part by weight, and the co-activator has a molar concentration equal to a molar concentration of the activator, and wherein a contaminative chlorine concentration of a chlorine-containing compound contained in the phosphor powder is 20 ppm or less.