Patent ID: 7678293
Filing Date: 2010-03-16
Classification: C09K,H01L,Y10S,Y10T

Abstract:
1. A coated phosphor, comprising: a powder of individual grains of a phosphor as base material, the grains being coated with a non-conductive external layer of a coating material, the phosphor being excitable by ultraviolet or visible radiation, wherein the non-conductive external layer has an inhomogeneous thickness with a mean layer thickness of at least 20 nm and comprises a plurality of individual layers, each of the individual layers comprising the coating material and being particulate in form, the individual primary particles of the non-conductive external layer being at least 5 nm in size, and at least some of the individual primary particles of the coating material of the non-conductive external layer are lumped together to form aggregates and agglomerates thereby forming the inhomogeneous thickness of the non-conductive external layer.