Surface coating strontium silicate phosphor particles and a light emitting diode having a phosphor particle

摘要

PROBLEM TO BE SOLVED: To provide a strontium silicate phosphor particle capable of be prevented from decompositional degradation of the surface due to steam and water, causing no decrease in luminance and no change in color tone in a long-term usage and a temperature rise, and excellent in water resistance and chemical stability; and to provide light-emitting diode having the phosphor particle.;SOLUTION: The surface-coated strontium silicate phosphor particle has a coating layer of an amorphous zirconium compound having a thickness of 100 to 800 nm on the surface of a strontium silicate phosphor particle, and has a density in the range of 85 to 95% when the density of the phosphor particle as a single substance is taken to be 100%. The surface-coated strontium silicate phosphor particle is obtained by holding a highly dispersed state in which an aluminum-based organometal compound is adsorbed on the surface of the phosphor particle dispersed in an organic solvent, coating the surface with the zirconium compound, thereafter separating the resultant from the organic solvent, and heating and firing the resultant to thereby form a coating layer of the amorphous zirconium compound.;COPYRIGHT: (C)2013,JPO&INPIT