Abstract
The set of non-linear differential equations that generally have been employed to describe the electron transfer processes in infra-red phosphors has been solved by means of a differential analyzer in the general case, and approximate solutions have been obtained for cases of practical interest. It is shown that the simultaneous measurement of the brightness and instantaneous photo-current in a phosphor stimulated by infra-red light allows a determination to be made of the ratio of the cross sections for electron capture into empty trapping centers and into empty luminescent centers. This cross-section ratio can also be determined from measurements of the light sum and the maximum instantaneous photo-current.
© 1948 Optical Society of America
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