Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – Plural light emitting devices
Reexamination Certificate
2006-04-04
2006-04-04
Nelms, David (Department: 2818)
Active solid-state devices (e.g., transistors, solid-state diode
Incoherent light emitter structure
Plural light emitting devices
C257S079000, C257S099000, C313S502000, C313S503000, C313S506000
Reexamination Certificate
active
07023019
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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Hanada Yasuyuki
Ikeda Tadaaki
Iwama Katsuaki
Kamei Hidenori
Kitahara Hiromi
McDermott Will & Emery LLP
Nguyen Dao H.
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