Process for the preparation of pink light-emitting diode...

Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides

Reexamination Certificate

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Reexamination Certificate

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07147803

ABSTRACT:
The subject invention relates to yttrium aluminum garnet fluorescent powders with formula (Y3-x-yZxEuy)Al5O12or (Y3ZxEuy)Al5O12, wherein 0<x≦0.8, 0<y≦1.5, and Z is selected from a group consisting of rare earth metals other than europium (Eu). The subject invention also relates to a pink light-emitting device, which comprises a light-emitting diodes as a luminescent element and a fluorescent body containing yttrium aluminum garnet fluorescent powders, wherein the diode emits a light with a wavelength ranging from 370 to 410 nm, which then excites the yttrium aluminum garnet fluorescent powders in the fluorescent body to emit another light with a wavelength ranging from 585 nm to 700 nm, so the two lights combine to produce a pink light. The subject invention also relates to the preparation of the yttrium aluminum garnet fluorescent powders.

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patent: 5037577 (1991-08-01), Yamanoi et al.
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patent: 5600202 (1997-02-01), Yamada et al.
patent: 6509651 (2003-01-01), Matsubara et al.
patent: 6596195 (2003-07-01), Srivastava et al.
patent: 6869544 (2005-03-01), Chen et al.

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