Light-emitting semiconductor device, light-emitting system and method for fabricating light-emitting semiconductor device

A light-emitting semiconductor device comprising:

• a blue-light-emitting diode which emits blue light, the blue-light-emitting diode having a light extraction surface;
• and
• a luminescent layer which includes a yellow/yellowish phosphor that absorbs blue light emitted by the blue-light-emitting diode to emit a yellow/yellowish fluorescence,
• wherein the luminescent layer is exposed on the blue-light-emitting diode,
• the yellow/yellowish phosphor contains a compound expressed by the chemical formula:
• (Sr1−a1−b2−xBaa1Cab2Eux)2SiO4
• (where 0≦a1≦0.3, 0≦b2≦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
• a portion of the luminescent layer located at least on the light extraction surface of the blue-light-emitting diode has a substantial thickness in the range from 50 μm to 1000 μm, both inclusive.