Infrared sensing device outputting orange light and a process fo

Details Infrared sensing device outputting orange light and a process fo Infrared sensing device outputting orange light and a process fo

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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