Patent ID: 7772769
Filing Date: 2010-08-10
Classification: C09K,F21S,F21Y,H01L,H05B,Y02B

Abstract:
1. A light-emitting semiconductor device comprising: a blue-light-emitting diode emitting light having a main emission peak in a wavelength range greater than 430 nm and less than or equal to 500 nm; and a luminescent layer including a phosphor which absorbs blue light emitted by the blue-light-emitting diode to emit a fluorescence, the light-emitting semiconductor device being configured to emit white light whose correlated color temperature is in the range from 2000 K to 12000 K, both inclusive, by adding the colors of the blue light and the fluorescence, and the luminescent layer being made of a mixture of phosphor particles and a translucent resin and covering at least a main light extracting surface of the blue-light-emitting diode, wherein the phosphor used for the luminescent layer has an absolute specific gravity in the range from 3.0 to 4.65, both inclusive, and has a particle size in the range from 0.5 μm to 30 μm, both inclusive, the phosphor particles are yellow/yellowish phosphor particles emitting the fluorescence having a main emission peak in the wavelength range from 560 nm to 600 nm, both inclusive, and are a compound not including Cd, and the resin has an absolute specific gravity in the range greater than or equal to 0.8 and less than or equal to the absolute specific gravity of the phosphor.