Specialized phosphors prepared by a multi-stage grinding and fir

Details Specialized phosphors prepared by a multi-stage grinding and fir Specialized phosphors prepared by a multi-stage grinding and fir

1997-01-17

2000-03-28

Patel, Nimeshkumar D.

Compositions

Inorganic luminescent compositions

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

2523016R, 313467, 313468, 313503, 427 64, C09K 1154, C09K 1100

Patent

active

060427469

ABSTRACT:
A multi-stage process for preparing a phosphor product includes the stages of selecting precursors of a dopant and a host lattice as the phosphor starting materials, grinding the starting materials in an initial grinding stage for an initial grinding time period to produce an initial ground material having a smaller particle size distribution than the starting materials, firing the initial ground material in an initial firing stage at an initial firing temperature for an initial firing time period to produce an initial fired material, grinding the initial fired material in an intermediate grinding stage for an intermediate grinding time period to produce an intermediate ground material having a smaller particle size than the initial fired material, wherein the intermediate grinding time period is substantially less than the initial grinding time period, firing the intermediate ground material in an intermediate firing stage at an intermediate firing temperature for an intermediate firing time to produce an intermediate fired material, wherein the intermediate firing temperature is substantially greater than the initial firing temperature, grinding the intermediate fired material in a final grinding stage for a final grinding time period to produce a final ground material having a smaller particle size than the intermediate fired material, and firing the final ground material in a final firing stage at a final firing temperature for a final firing time to produce a phosphor product, wherein the final firing time is substantially less than the intermediate firing time.

REFERENCES:
patent: 3635833 (1972-01-01), Datta
patent: 3723339 (1973-03-01), Wanamker et al.
patent: 4119562 (1978-10-01), Kagami et al.
patent: 4275333 (1981-06-01), Kagami et al.
patent: 4894583 (1990-01-01), Berkstresser et al.
patent: 4924139 (1990-05-01), Morita et al.
patent: 4925593 (1990-05-01), Borchardt et al.
patent: 5115306 (1992-05-01), Tsuda et al.
patent: 5185553 (1993-02-01), Yang et al.
patent: 5229331 (1993-07-01), Doan et al.
patent: 5232549 (1993-08-01), Cathey et al.
patent: 5635100 (1997-06-01), Chadha et al.
Dharmadhikari, D. M. et al., Abstract: "Structural Study of ZnY.sub.2 O.sub.4 ", Indian J. Phys. 53A, 459-460 (1979).

Affiliated with

Also associated with

Rating

Specialized phosphors prepared by a multi-stage grinding and fir does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Specialized phosphors prepared by a multi-stage grinding and fir, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Specialized phosphors prepared by a multi-stage grinding and fir will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1323163