Patent ID: 7629620

Claim:
A light-emitting semiconductor device having a structure in which a flip-chip-type blue LED is mounted on a substrate and is electrically connected thereto and in which the flip-chip-type blue LED is molded with a package of a luminescent layer, wherein the flip-chip-type blue LED emits blue light having a main emission peak in the wavelength range greater than 430 nm and less than or equal to 500 nm, the luminescent layer includes a yellow/yellowish phosphor that absorbs the blue light emitted by the flip-chip-type blue LED to emit a yellow/yellowish fluorescence, the yellow/yellowish phosphor contains, as a main component, a compound expressed by the chemical formula: (Sr 1-a1-b2-x Ba a1 Ca b2 Eu x ) 2 SiO 4 (where 0<a 1 <0.3, 0<b 2 <0.6, 0.005<x<0.1), the yellow/yellowish phosphor has a particle size in the range from 0.5 μm to 30 μm, both inclusive, and is made of a silicate phosphor having an orthorhombic structure, and the blue light emitted by the flip-chip-type blue LED passes through the luminescent layer so that the color of the fluorescence emitted by the phosphor is added to the color of the blue light, thereby producing white light.