Optical characteristics of Tb3+ions in soda glass

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Abstract
The optical properties of terbium doped soda glass have been investigated as a function of terbium concentration. The properties studied in this work were the excitation luminescence and absorption spectra and the luminescence decay times. In the case of short wavelength excitation, the absorption occurs in the glass matrix and is followed by energy transfer to the Tb3+ ions. At long wavelengths the efficiency of energy transfer between Tb3+ ions by dipole-dipole interaction is small up to quite high concentrations of terbium in the glass. However, above approximately 1 wt.%Tb the intensity of the luminescent 5D4 to 7Fj transitions increases very rapidly with terbium concentration. It is suggested that in this range energy transfer occurs between the ions of a Tb3+ ion pair by means of an exchange-dipole interaction.

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