Triorthogermanates BaYb 2 -x Er x Ge 3 O 10 (x = 0.1-0.3) and BaY 2 -10y Yb 9y Er y Ge 3 O 10 (y = 0.015-0.15) are synthesized by the solid phase method. According to X-ray powder diffraction data, the compounds crystallize in a monoclinic system, space group P2 1 /m, Z = 2. The concentration and power dependences of upconversion luminescence that occurs in the range of 510-720 nm upon excitation by radiation with a wavelength of 980 nm are studied. The mechanism of energy transfer between optical sites is proposed and the optimal composition of the phosphor is determined. The temperature dependence of the ratio of the luminescence band intensities with maxima at 521 nm and 552 nm (the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions in Er 3+ ) is studied, and conclusions are drawn about the possible application of triorthogermanates as materials for fluorescent temperature sensors.
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