Process for producing phosphors

Details Process for producing phosphors Process for producing phosphors

2008-05-27

2008-05-27

Koslow, C. Melissa (Department: 1793)

Compositions

Inorganic luminescent compositions

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

C252S30160S, C252S30140F, C252S30160F, C252S301500, C252S30140R, C252S30160R, C252S30140P, C252S30160P

Reexamination Certificate

active

07378038

ABSTRACT:
A mixed melt, which contains urea and/or a urea derivative and contains a metal compound, is prepared. The mixed melt is solidified, by heating, whereby the urea and/or urea derivative is decomposed, a precursor being thereby prepared. The thus prepared precursor is ground, and then the thus ground precursor is fired. The metal of the metal compound may be at least one kind of a metal selected from the group consisting of Al, B, Ba, Be, Bi, Ca, Cd, Cs, Ga, Ge, Hf, In, K, Li, Mg, Mo, Na, Nb, P, Rb, Si, Sn, Sr, Ta, Ti, V, W, Zr, and rare earth metals. A finely powdered phosphor free from inclusion of impurities and having uniform particle size is thus produced at a low cost and efficiently.

REFERENCES:
patent: 6274110 (2001-08-01), Kim et al.
patent: 7009337 (2006-03-01), Urabe

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