PHOSPHOR AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To provide a phosphor comprising at least either nitride or oxynitride including alkaline-earth metal elements, silicon and activator elements with small particle diameters having excellent light emitting properties, and a method for producing the same.SOLUTION: Provided is a phosphor in which the volume average particle diameter is 50 to 400 nm, and the internal quantum efficiency in an excitation wavelength of 450 nm is 60% or higher. The method for producing the phosphor comprises: a precursor preparation step of preparing phosphor precursor particles in which the volume average particle diameter is 250 nm comprising a compound including silicon nitride particles and alkaline-earth metal elements deposited on the surface of each silicon nitride particle and a compound including activator elements; and a firing step of firing the phosphor precursor particles.SELECTED DRAWING: Figure 1 【課題】発光特性の優れた小粒径の、アルカリ土類金属元素、ケイ素および賦活剤元素を含有する窒化物および酸窒化物の少なくとも一方を含む蛍光体およびその製造方法を提供する。【解決手段】蛍光体は、体積平均粒径が５０ｎｍ以上４００ｎｍ以下であり、励起波長４５０ｎｍにおける内部量子効率が６０％以上である。蛍光体の製造方法は、窒化ケイ素粒子と窒化ケイ素粒子の表面に堆積されたアルカリ土類金属元素を含有する化合物と賦活剤元素を含有する化合物とを含み、体積平均粒径が２５０ｎｍ以下である蛍光体前駆体粒子を準備する前駆体準備工程と、蛍光体前駆体粒子を焼成する焼成工程とを含む。【選択図】図１