Photoluminescent material for outputting reddish-orange light wi

Details Photoluminescent material for outputting reddish-orange light wi Photoluminescent material for outputting reddish-orange light wi

1989-06-08

1991-08-27

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

2523014H, C09K 1156

Patent

active

050430971

ABSTRACT:
A photoluminescent material used for detection of infrared light is prepared using a base material, first and second dopants, a carbonate of the base material, and a fusible salt. The base material is an alkaline earth metal sulfide such as calcium sulfide. Calcium carbonate is used to decrease phosphorescence after charging, whereas lithium fluoride is used to allow the material to be fused together. Samarium oxide and europium oxide are used as the first and second dopants for establishing a communication band and an electron trapping level, respectively. The photoluminescent material is made according to a process involving drying the material, heating the material in a graphite crucible to a fusing temperature in a dry inert atmosphere, grinding the material after cooling, and reheating the material to below the fusing temperature, but sufficiently high to repair the crystal surfaces. The material is then placed in a transparent binder and applied to a substrate. Alternatively, thin film techniques may be used to apply the material to a substrate to realize a device with fine optical resolution.

REFERENCES:
patent: 2521124 (1950-09-01), Miller
patent: 4747973 (1988-05-01), Cusano et al.
patent: 4839092 (1989-06-01), Lindmayer

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