Abstract

An investigation of the temperature variation of the cathodoluminescence efficiency of a manganese-activated zinc-fluoride phosphor (tetragonal-ZnF2·0.005Mn) revealed a pronounced secondary increase in efficiency when the temperature was raised above 210° to about 330°C. This efficiency increase was accompanied by an intensity increase in the power-law-decay “tail” through that temperature range. The rapid emptying of traps at these temperatures, followed by radiative transitions of the freed electrons, can account for both observed results. Similar effects were found for a manganese-activated zinc-sulfide phosphor (hexagonal-ZnS·0.018Mn), and for a copper-activated zinc-cadmium-sulfide phosphor (hexagonal-9ZnS·CdS·0.0001Cu). All measurements were made on aluminum-backed phosphor screens in sealed-off cathode-ray tubes. Decays were measured by photographing the output of a multiplier photo-tube as recorded on a d.c. oscilloscope.

© 1949 Optical Society of America

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