Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating
Patent
1989-04-14
1991-02-12
Morgenstern, Norman
Coating processes
Electrical product produced
Fluorescent or phosphorescent base coating
427 64, 427 71, 2523014S, 2523014H, B05D 506, C09K 1108
Patent
active
049923021
ABSTRACT:
Photoluminescent materials useful for detection of infrared light are prepared using a base material, first and second dopants, barium sulfate and a fusible salt. The base material is an alkaline earth metal sulfide such as strontium sulfide, calcium sulfide, or a mixture of strontium sulfide and calcium sulfide. Barium sulfate is used to increase the brightness of output light, whereas lithium fluoride is used to allow the material to be fused together. Samarium, cerium and europium compounds are used in specific examples as dopants for providing electron traps. The photoluminescent material is made according to a process involving drying the mixture in a dry inert atmosphere, and heating the mixture in the inert atmosphere in a graphite crucible to a fusing temperature. The resultant material can then be applied to a substrate using thin film physical vapor deposition techniques. Alternatively, it can be ground into a powder, dried and reheated to below the fusing temperature, but sufficiently high to repair the crystal surfaces, and then placed in a transparent binder and applied to a substrate.
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Morgenstern Norman
Padgett Marianne L.
Quantex Corporation
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