Light-emitting semiconductor device, light-emitting system...

Details Light-emitting semiconductor device, light-emitting system... Light-emitting semiconductor device, light-emitting system...

2005-06-03

2008-09-09

Ton, Toan (Department: 2889)

Electric lamp or space discharge component or device manufacturi

Process

With assembly or disassembly

C445S023000, C313S502000, C313S503000

Reexamination Certificate

active

07422504

ABSTRACT:
A chip-type light-emitting semiconductor device includes: a substrate4; a blue LED1mounted on the substrate4; and a luminescent layer3made of a mixture of yellow/yellowish phosphor particles2and a base material13(translucent resin). The yellow/yellowish phosphor particles2is a silicate phosphor which absorbs blue light emitted by the blue LED1to emit a fluorescence having a main emission peak in the wavelength range from 550 nm to 600 nm, inclusive, and which contains, as a main component, a compound expressed by the chemical formula: (Sr1-a1-b1-xBaa1Cab1Eux)2SiO4(0≦a1≦0.3, 0≦b1≦0.8 and 0<x<1). The silicate phosphor particles disperse substantially evenly in the resin easily. As a result, excellent white light is obtained.

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