Photoluminescent material for outputting orange light with reduc

Details Photoluminescent material for outputting orange light with reduc Photoluminescent material for outputting orange light with reduc

1989-06-08

1991-04-09

Morgenstern, Norman

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 64, 2523014S, 2523014H, B05D 506, C09K 1108

Patent

active

050063669

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 strontium sulfide. Strontium 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 for luminescence and a 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: 2522074 (1950-09-01), Urbach
patent: 3988252 (1976-10-01), Ferretti
patent: 4041140 (1977-08-01), Nitta et al.
patent: 4052329 (1977-10-01), Fukuda et al.
patent: 4230598 (1980-10-01), Vedrine et al.
patent: 4264677 (1981-04-01), Koyama et al.
patent: 4348299 (1982-09-01), Okamoto et al.
patent: 4877994 (1988-10-01), Fuyama et al.

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