Absorption, excitation, and emission spectra of europium have been measured in metaphosphate glasses, The oscillator strengths of the transitions of the 7Fo and 'F1 levels are calculated and compared with the values for aqueous solutions. The intensities and half-bandwidths of fluorescence from the SDo levels are compared with those of silicate glasses and aqueous solutions. The influence of the crystal fields of the glass 013 the hypersensitive AJ = 2 transition is discussed. The point symmetry of Eu in phosphate glass was found to be C,. The broadening of the spectral lines in glasses and aqueous solutions has been attributed to a multiplicity of sites with the same symmetry and various crystal field parameters.

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Measurements of emission spectra and decay times of Eu3+, Sm3+ Tb3+, Dy3+ and Gd3+ and their concentration dependence were taken in silicate glasses, in the concentration range 0.05–1.00 weight percent, under monochromatic excitation. The results are compared with those obtained in borate glasses. The lower intensities of the main emission lines for all the five R. E., the longer decay times for Tb3+ and Sm3+ and the shift to shorter wavelengths for Eu3+ and Sm3+ are explained in terms of the lower field strength seen by the R. E. in silicate glasses and smaller energy transfer probabilities.