Patent ID: 8158026
Filing Date: 2012-04-17
Classification: C09K,H01L

Abstract:
1. A method for preparing a β-SiAlON phosphor, the method comprising: weighing a silicon raw material, an aluminum raw material and an activator raw material in order to prepare a β-SiAlON phosphor represented by Formula: Si mixing the starting materials to prepare a raw material mixture; and heating the raw material mixture in a nitrogen-containing atmospheric gas, wherein the starting material comprise: at host raw material including a silicon raw material including metallic silicon and optionally a silicon compound, and at least one aluminum raw material selected from the group consisting of metallic aluminum and aluminum compound, wherein at least one of the silicon raw material and the aluminum raw material contains both the metal and compound; at least one activator raw material selected from the rare earth elements for activating the host raw material, wherein the method further comprises the step of adjusting at least one of a mixture ratio of metallic silicon and silicon compound and a mixing ratio of metallic aluminum and aluminum compound to control the particle size distribution of the β-SiAlON phosphor, and wherein the metallic silicon is in the form of powder and has an average particle diameter of 300 μm or less.