| 简介 |
PROBLEM TO BE SOLVED : To provide a method for producing oxide fluorescent particles which have a stabilized spherical or nearly spherical shape, and in which mutual necking of particles or coarsening of the particles scarcely occurs, by using simple loosening and classification steps, or even without passing through these steps, and to provide a light-emitting device using the oxide fluorescent particle obtained by this method.
SOLUTION : The oxide fluorescent particles are produced by melting a metal material including one or more kinds of rare earth metals selected from rare earth metals including Sc and Y and one or more kinds of metals selected from Al, Ga, In, Si and Ge to form an alloy, forming the alloy into spherical or nearly spherical shaped fine particles with an average particle diameter of 50 μm or less, and oxidizing the alloy fine particles. The fluorescent particles obtained by the production method scarcely cause necking or fusion, and consequently, in the production process of the fluorescent particles, loosening and classification steps for eliminating the necking or fusion are reduced. Also in comparison with conventional fluorescent particles, particle size distribution is more sharpened, and when the fluorescent particles are actually used, the fluorescent particles have excellent flowability and are handled with ease in coating and mixing steps of the particles. Furthermore, output efficiency of emission of the phosphor is improved since the shape is kept constant.
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