ULTRAVIOLET PHOSPHOR DEVELOPMENT FOR AN ACTIVE OPTICAL IMAGING SYSTEM.
Final development rept. 15 Jun 64-15 Jun 65.
WESTINGHOUSE DEFENSE AND ELECTRONIC SYSTEMS CENTER BALTIMORE MD AEROSPACE DIV
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Cathodoluminescent powdered phosphors with primary emission in the ultraviolet region were synthesized and investigated for high-power radiant output, long life maintenance capability and short decay time. The materials studied were doped and undoped aluminum oxide, lead and thallium-doped silicates, borates, and germanates, and undoped beryllium silicate. These materials were investigated in demountable or sealed-off cathode ray tubes. Results were compared to a standard set by P-16 phosphor calcium magnesium silicate cerium. A number of samples were found to be superior to P-16 for flying spot scanner and other high-power output applications. Calcium silicatelead 3380 A and barium silicatelead 3520 A both have radiative power output twice that of P-16 under high beam power inputs. Both also have superior aging characteristics the decay times are of the same order of magnitude. The efficiencies of calcium boratelead 2700 A and calcium silicatecadmium 3550 A are about the same as those of P-16 under high-power excitation, but the far ultraviolet emission of the former is desirable for secure optical systems. Author