Patent ID: 8747681
Filing Date: 2014-06-10
Classification: H01L,H05B

Abstract:
1. A preparation method of a phosphor powder layer, comprising: step one, coating a fluorescent powder layer on a surface of a transparent substrate, the transparent substrate being a flat-plate shape; step two, forming a curved surface on a sheet by surface processing; step three, disposing the sheet obtained in step two on the fluorescent powder layer coated on the transparent substrate of step one, wherein the curved surface of the sheet faces to the substrate, and the fluorescent powder layer is sandwiched between the substrate and the sheet; step four, softening the substrate by heating, then applying a pressure to the sheet so that the fluorescent powder layer sandwiched between the substrate and the sheet forms the phosphor powder layer having the same curved surface shape as the curved surface of the sheet under the pressure, and the phosphor powder layer arranged on the substrate is obtained after cooling, wherein the phosphor powder layer includes a phosphor powder material selected from the group consisting of Y