Efficient, size-selected green-emitting phosphors

Details Efficient, size-selected green-emitting phosphors Efficient, size-selected green-emitting phosphors

2006-03-28

2006-03-28

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

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

C313S486000, C313S503000, C257S098000, C257SE33061

Reexamination Certificate

active

07018565

ABSTRACT:
Provided among other things is a method of forming a phosphor of the formulain-line-formulae description="In-line Formulae" end="lead"?SrGa2S4:Eu:xGa2S3  (I)in-line-formulae description="In-line Formulae" end="tail"?wherein x is 0.0001 to 0.2, wherein a minor part of the europium component may be substituted with praseodymium in an efficiency enhancing amount, and wherein the median grain size of the phosphor composition is from 2 to 12 microns, the method comprising:precipitating SrSO4and Eu(OH)3under conditions selected as appropriate for achieving the desired average grain size in a product of the method;precipitating Ga(OH)3with product of the first precipitating step;at least once conducting the following two sub-steps:grinding the product of the second precipitating step or of a subsequent iteration of this step; andfiring the ground product in hydrogen sulfide;at least once suspending the fired product in solvent in which it is not soluble and providing a period of time for a portion of the fired product to settle leaving a second portion suspended; andcollecting the phosphor in one or more of the suspended or settled portions.

REFERENCES:
patent: 6544438 (2003-04-01), Yocom et al.
patent: 2002/0149001 (2002-10-01), Ellens et al.
patent: 2002/0190241 (2002-12-01), Le Mercier et al.

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