Abstract

An unusual fine structure of emission has been reported1 for some manganese-activated magnesium germanate phosphors. In order to determine the precise nature of the transitions involved, the temperature dependence of the actual intensities, half-widths and peak positions of the individual emission bands have been measured from −190°C to +90°C using ultraviolet excitation. The measurements were made in a constant temperature vacuum sample chamber and with a Littrow type spectrograph containing calibrated photographic plates. Five emission bands were clearly resolved between 6200 and 6800A. The intensity of each band increases with temperature up to a critical temperature above which the efficiency decreases rapidly. Also, the short wave-length bands practically disappear at −190°C, and the individual bands shift slightly to shorter wave-lengths and decrease in half-width at low temperatures. The experimental results are qualitatively interpreted, and tentative correlations with atomic spectra are proposed.

© 1949 Optical Society of America

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