Literature on the phenomenon of electroluminescence, the photo- conductive properties of CdS and CdSe, the electroflor phosphors, thin photoconductive films, and image tubes is reviewed. Three solid-state light amplifiers and their applications are discussed, as well as the application of electroflors and the electroluminescent lamp to plotting boards, X-ray screens, radar and television displays, relays, and to the digital display of analog information. The discussion emphasizes the development and application of the solid-state light amplifier, the electroflor, and the image tube as electronic shutters. Of these, the image tube is considered the most available commercially as an electronic shutter and for this purpose requires the least development. Both the solid-state light amplifier and the electroflors show much promise as shutters but their use as such requires further development.
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