Abstract

When excited by the proper wavelength, Tb+3 in Y2O3 transfers some of that energy to Eu+3 centers which subsequently emit 6125-Å light. The actual mechanism involves an initial high-energy excitation state (a broad band, indicating a perturbed activator state) which relaxes to one of the 5DJ states, from which emission occurs in about 1.0 msec. The phenomenon occurs only under specific conditions of ultraviolet excitation, not under cathode-ray excitation.

© 1967 Optical Society of America

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