Abstract
Yb 3+ -doped YAlO3 single crystals have been grown by the Czochralski method with a radio-frequency heating system. Starting melt compositions of Y1−xYbxAlO3 were varied with x=0.02, 0.1, 0.2, 0.3, and 0.45. The best Yb3+-doped YAlO3 single crystals were obtained for a growth rate of 1.0 mm/h. The grown crystals were transparent and almost colorless. To investigate the homogeneity, the effective segregation coefficient of the Yb ion was estimated. The absorption, photoluminescence, and luminescence decay kinetics of Yb3+-doped YAlO3 were investigated for the temperature range 4–300 K. Very fast charge transfer luminescence of Yb3+ from the near ultraviolet to visible spectral range and the high density of the Yb-rich YAlO3 makes this material a promising candidate for fast scintillators.
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