Abstract

A frequency response method for high speed spectrophotometry, which is characterized by simpler instrumentation and narrower frequency bandwidth than the stroboscopic method, is developed from frequency domain considerations of a transient process. Time-resolved emission spectra of Y2O2S:Tb and Y2O2S:Eu show that Tb3+ and Eu3+ undergo two and three different types of transient processes, respectively. These processes are assigned to transitions from 5Dj to 7F. Resolving power for time resolution is suggested as a new criterion for system evaluation and calculated for the frequency response and stroboscopic methods.

© 1970 Optical Society of America

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