Process for providing hydrolysis resistant phosphors

Details Process for providing hydrolysis resistant phosphors Process for providing hydrolysis resistant phosphors

1989-04-24

1991-05-07

Cooper, Jack

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

2523014S, 2523016S, 427215, 4273722, C09K 1184

Patent

active

050135821

ABSTRACT:
A process is disclosed for making a rare-earth oxysulfide phosphor resistant to hydrolysis, which comprises forming a slurry of the phosphor in water, adding to the slurry, a zinc compound in an amount sufficient to result in a zinc ion concentration in the water of from about 0.01 molar to about 0.05 molar, separating the resulting zinc-treated phosphor from the liquid portion of the slurry, heating the zinc-treated phosphor in air at a temperature of from about 500.degree. C. to about 600.degree. C. for a sufficient time to enhance the brightness of the phosphor, and screening the resulting heated phosphor to remove non-luminescent material therefrom. The phosphor has a resistance to hydrolysis that is at least about 50% greater than phosphors produced without the zinc treatment.

REFERENCES:
patent: 4507560 (1985-03-01), Mathers et al.
patent: 4568479 (1986-02-01), Trond et al.
patent: 4624861 (1986-11-01), Yale et al.
patent: 4690832 (1987-09-01), Yale

Affiliated with

Also associated with

Rating

Process for providing hydrolysis resistant phosphors does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for providing hydrolysis resistant phosphors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for providing hydrolysis resistant phosphors will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-938721