Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1987-04-03
1989-02-21
Morganstern, Norman
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
25230145, 2523014H, 427 64, 428690, 428691, H05B 3300, C09K 1108, B05D 506
Patent
active
048067725
ABSTRACT:
Photoluminescent materials useful for detection of infrared light are prepared using a base material, first and second dopants, barium sulfate and a fusable salt. The base material is an alkaline earth metal sulfide or selenide such as strontium 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 and europium oxide are used as the first and second dopants for providing electron traps. The photoluminescent material is made according to a process involving heating of the material to a fusing temperature, grinding the material after cooling, and reheating the material to below the fusing temperature, but sufficiently high to repair the crystal surfaces. An infrared sensing device or card is constructed by placing the material in a transparent binder and applying it to a substrate. The material and substrate may then by encapsulated.
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Morganstern Norman
Padgett Marianne L.
Quantex Corporation
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