Phosphors and methods of preparing the same

Details Phosphors and methods of preparing the same Phosphors and methods of preparing the same

1988-11-23

1989-08-15

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

2523014H, C09K 1188

Patent

active

048572284

ABSTRACT:
Phosphors based on a crystalline matrix of an alkaline earth and a chalcogen together with an activator system are prepared by a process which preferably includes exposure to both S and Se vapors. The phosphors have enhanced light output. IR-stimulable phosphors have stimulation quantum efficiencies above 5%, and preferably include Eu:Sm or Eu:Bi activator systems. Eu:Cu activators provide phosphorescent phosphors.

REFERENCES:
patent: 2402759 (1946-06-01), Leverenz
patent: 2522074 (1950-09-01), Urbach
patent: 2527365 (1950-10-01), Leverenz
patent: 4442377 (1984-04-01), Higton et al.
patent: 4755324 (1988-07-01), Lindmayer
Primak et al., "J. Amer. chem. Soc.", vol. 69, 1947, pp. 1283-1287.

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