Emission Spectra of Trivalent Terbium

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Abstract
The luminescent emission spectra of the members of the series Y1—xTbx antipyrene 6I3 and Ca1–2xNaxTbx WO4 have been measured and compared. The antipyrene complexes show spectra similar to that for terbium octahydrosulfate which is a simple inverted multiplet. The tungstate spectra results from emissions originating from two electronic levels. The relative intensities of the emissions from these two states are dependent upon the terbium concentration. In Na0.5Tb0.5WO4 the usual spectral bands are by far the stronger. In CaWO4:Tb0.0001 the situation is reversed.