Concentration dependence of refractive index of the glassy Li2B4O7 on the Er3+, Tb3+, Eu3+ activators

Abstract

Determination of the refractive index of vitreous LTB and the influence on it of any dopants, especially the rare-earth (RE) oxides, which are included in the matrix of solids in the form of three-charged ions, has not been realized at all. When interpreting the spectra of thermo-, X-ray, photoluminescence and absorption spectra, a knowledge of the refractive index and its change with introduction of different activators (in this case, vitreous Li2B4O7 activation by triple-charge RE ions) is necessary to calculate the probabilities of optical (both radiative and excitative) transitions and the factor of splitting the optically active activator energy levels.