Method of making electroluminescent phosphors with small...

Details Method of making electroluminescent phosphors with small... Method of making electroluminescent phosphors with small...

2007-10-30

2007-10-30

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

Zinc or cadmium containing

C313S503000

Reexamination Certificate

active

10907358

ABSTRACT:
An electroluminescent phosphor powder includes copper-activated zinc sulfide particles that have a size distribution with a D50 value of no more than 10 μm, where no more than 25% of the particles have a size greater than about 15 μm and/or a 24-hr brightness of at least 15 footlamberts. These particles are made by a method that includes first firing copper-doped zinc sulfide mixed with zinc oxide, sulfur and a chloride-containing flux, rapidly cooling the mixture to below 100° C., and then mulling and second firing the mixture to provide a powder. The powder can then be elutriated to provide the electroluminescent powder with a narrow particle size distribution (more than 90% between about 5 and 15 μm). The elutriating step can be avoided (albeit with a slightly wider size distribution) by more tightly controlling the first firing temperature.

REFERENCES:
patent: 4859361 (1989-08-01), Reilly et al.
patent: 5009808 (1991-04-01), Reilly et al.
patent: 5220243 (1993-06-01), Klinedinst et al.
patent: 5244750 (1993-09-01), Reilly et al.
patent: 5525313 (1996-06-01), Kawano et al.
patent: 5643496 (1997-07-01), Brese et al.
patent: 5702643 (1997-12-01), Reddy et al.
patent: 6064150 (2000-05-01), Klinedinst et al.
patent: 6090311 (2000-07-01), Brese et al.
patent: 6248261 (2001-06-01), Takemura et al.
patent: 6309700 (2001-10-01), Fan et al.
patent: 6702958 (2004-03-01), Takehara et al.
patent: 7067071 (2006-06-01), Kappe et al.
patent: 2002/0113226 (2002-08-01), Takehara et al.
patent: 2006/0071587 (2006-04-01), Yamaguchi et al.
patent: 2006/0230980 (2006-10-01), Kappe et al.
patent: 887 094 (1953-08-01), None
patent: 1 215 263 (2002-06-01), None
patent: 1 367 113 (2003-12-01), None
patent: 09-13029 (1997-01-01), None
patent: WO 91/16722 (1991-10-01), None
patent: WO 01/34723 (2001-05-01), None
patent: WO 01/34723 (2001-05-01), None
patent: WO 2004/031322 (2004-04-01), None
U.S. Appl. No. 10/907,360, filed Mar. 30, 2005 to Belinski-Wolfe et al.

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