Light emitting device having silicate fluorescent phosphor

Details Light emitting device having silicate fluorescent phosphor Light emitting device having silicate fluorescent phosphor

2006-01-03

2006-01-03

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

C313S486000, C313S503000, C257S098000, C257SE33061

Reexamination Certificate

active

06982045

ABSTRACT:
Provided herein are novel phosphors useful in the manufacture of white light emitting diodes. The phosphors provided by the invention are described by the formula:in-line-formulae description="In-line Formulae" end="lead"?SrxBayCazSiO4:Euin-line-formulae description="In-line Formulae" end="tail"?in which x, y, and z are each independently variable to be any value between about 0 and about 2, including without limitation 0.001 and 2, and every thousandth therebetween, subject to the proviso that the sum of x, y, or z is equal to at least 1, and in which Eu is present in any amount between about 0.0001% and about 5% by weight based upon the phosphor's total weight, wherein substantially all of the europium present is present in the divalent state. A phosphor according to the invention may optionally further comprise an element selected from the group consisting of: Ce, Mn, Ti, Pb, and Sn and is present in any amount between about 0.0001% and about 5% by weight based on the phosphor's total weight. The silicate phosphor materials provided by the present invention do not require the addition of dissimilar blue and red phosphor compounds, and do not contain zinc and/or magnesium. In addition, the present invention provides materials which emit a broad yellowish color containing both green and red emissions.Standard techniques used in phosphor deposition for the manufacture of light emitting diodes which comprise phosphors may be employed to produce LED's having a white light output when the phosphors of the invention are utilized.

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Derwent Abstract for KR 2003060697, Jul. 16, 2003.
Derwent Abstract 2004-006160 for KR2003060697 published Jul. 16, 2003.

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