Abstract
A spectroscopic study is carried out in which the effects of added Ca 2+ and Ru 4+ transition metal ions on some characteristics of the emission of Gd 2O 2S : Tb 3+ phosphors (energy levels, intensities, lifetimes) are examined and compared. In order to distinguish the Tb 3+ emissions from impurity ones, the electronic energy levels of trivalent terbium are determined and the energy level scheme is completed by a crystal field analysis. The optical spectra reveal no terbium doped impurity phase; however, other rare earth ions present as impurities in the starting materials are detected. They are identified, and the influence of the added Ca 2+ and Ru 4+ on their emission lines is also examined.
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