| Summary: | A transparent Yb:YMgB<sub>5</sub>O<sub>10</sub> single crystal with dimensions up to 25 × 23 × 25 mm and weight 10.337 g was grown using a high-temperature solution growth on dipped seeds technique with a K<sub>2</sub>Mo<sub>3</sub>O<sub>10</sub> solvent. The Yb<sup>3+</sup> concentration was calculated to be 4.7 at.% (<i>N<sub>Yb</sub></i> = 3.71 × 10<sup>20</sup> atoms/cm<sup>3</sup>) with a distribution coefficient <i>K<sub>d</sub></i> of 0.59. The grown crystal was characterized by means of PXRD, TGA-DSC and ATR-FTIR techniques. The spectroscopic characteristics of the Yb:YMgB<sub>5</sub>O<sub>10</sub> crystal were demonstrated. Absorption cross-section spectra were produced. The luminescence spectra of the Yb:YMgB<sub>5</sub>O<sub>10</sub> crystal were measured in the spectral range of 950–1100 nm. The luminescence kinetics of the <sup>2</sup>F<sub>5/2</sub> energy level were investigated and the lifetime was determined.
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