Measurements are reported of the absorption, emission, and excitation spectra of Eu3+ in Y2O3, and also of fluorescence lifetime and quantum efficiency. An approximate level scheme is given. Conditions for laser action are calculated, and the results of a laser experiment are described. The importance of a strong ultraviolet excitation band probably corresponding to transitions from f-electron to d-electron levels is indicated.
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N. C. Chang (1963) studied this question.
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