White light LED device

Details White light LED device White light LED device

2005-08-30

2005-08-30

Lee, Eddie (Department: 2811)

Active solid-state devices (e.g., transistors, solid-state diode

Incoherent light emitter structure

Plural light emitting devices

C257S098000, C257S099000, C257S252000, C313S503000, C313S502000, C313S504000, C313S512000

Reexamination Certificate

active

06936857

ABSTRACT:
A light source including a specific LED and phosphor combination capable of emitting white light for direct illumination. In one embodiment, the light source includes an LED chip emitting in the 460-470 nm range radiationally coupled to a phosphor comprising Ca8Mg(SiO4)4Cl2:Eu2+,Mn2+. In a second embodiment, the light source includes an LED chip emitting at about 430 nm and a phosphor comprising a blend of Sr4Al14O25:Eu2+(SAE) and a second phosphor having the formula(Tb1-x-yAxREy)3DzO12, where A is a member selected from the group consisting of Y, La, Gd, and Sm; RE is a member selected from the group consisting of Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu; D is a member selected from the group consisting of Al, Ga, and In; x is in the range from 0 to about 0.5, y is in the range from about 0 to about 0.2, and z is in the range from about 4 to about 5. Both embodiments produce light having the coordinates x=0.240-0.260 and y=0.340-0.360 on the CIE chromaticity diagram.

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