Abstract

The rise and decay of luminescence of zinc silicate were measured at various excitation durations and intensities under cathode-ray excitation. The observed decays were displayed on a c-r oscilloscope. Measurements were made with short pulses of 1–280 microseconds separated by 20 milliseconds, and with square wave excitation. The pulse duration varied between 25 microseconds—10 milliseconds.

It was found the rise and decay curves could be separated into three components, which are strictly monomolecular, with time constants 200, 1800, and 72,000/sec. The duration of excitation does not influence the decay rates, but varies the proportions of the individual components. The fast component is predominant at very short excitation times. Using longer excitations however, the slow component gives the most part of the light emission. The same components were found with periodical excitation too. It was found that the excitation intensity does not affect the decay rates.

The brightness during the rise and decay was calculated for periodical excitation.

© 1950 Optical Society of America

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