Luminescent Characteristics of Silicate Glasses Doped with Rare Earths Under Monochromatic Excitation

Abstract

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.

Transition probabilities of europium in phosphate glasses

“…The objectives of this work were (1) to study the influence of the glass host on the transition probabilities of Eu3+ and (2) to compare the broadening of the europium fluorescence in glasses with the broadening in aqueous systems.…”

Fluorescence of Gd+++ in Alkali Halide Crystals

“…At room temperature, the lifetime decreased to 4.8 msec. Several papers on gadolinium doped crystals and glasses [18]. report values of about 4 msec for the decay rate of gadolinium at room temperature.…”

Inorganic ions in glasses and polycrystalline pellets as fluorescence standard reference materials

“…,-- b = repulsion coefficient: r= distance between active ion and nearest anion; n=4 to 1O~_ It was shown in a series of papers by Reisfeld et al [36][37][38][39][40], that the behavior of rare earths in glasses is similar to that of rare earths in inorganic crystals of low symmetry except for inhomogeneous broadening of the spectra due to a multiplicity of rare-earth sites in glasses. According to our theory [39] a rare·earth ion occupies a center of a distorted cube comprised of four tetrahedra of borate, phosphate or silicate.…”

“…The emission and excitation spectra of the disks were measured on a spectrofluorimeter built in this laboratory, the description of whi ch may be found in reference [36]. The emis sion spectra were corrected using standard compounds and their reported spectra.…”

“…Excitation and emission spectra were taken on a s pectrofluorimeter built in this laboratory [36]. The spectra were corrected with respect to light characteristics and spectral distribution of the photomultiplier by comparison with a similar spectrum taken on the Turner Model 210 spectrofluorimeter using standard compounds (quinine s ulfate, fluoresceine, etc.…”