[en] On the basis of TeO₂-WO₃ binary system the glasses activated with Er³⁺ and Yb³⁺ ions are synthesized. The dependence of erbium photoluminescence intensity on ytterbium concentration is investigated in visible and IR-ranges. The maximum value of photoluminescence intensity is obtained at erbium-ytterbium molar ratio of 1:1. The lifetime of luminescence in the best tellurite glasses constitutes of 7-9 ms

[en] This paper describes a comparative study of structural and luminescent properties of 5%Yb-doped yttrium, scandium, and lutetium oxides (Yb:RE₂O₃) powders and ceramics fabricated by self-propagating high-temperature synthesis. According to X-ray diffractometry and electron microscopy the chosen method ensures preparation of low-agglomerated cubic Ctype crystal structured powders at one step. No crucial differences in luminescence spectra were found the Yb:RE₂O₃ powders and ceramics. It was shown that the emission lifetimes of the Yb:RE₂O₃ powders are lowered by crystal structure defects, while its values for ceramics samples are compared to that of monocrystals and more influenced by rare earth impurities. (paper)