Up-Conversion Multiwave (White) Luminescence in the Visible Spectral Range under Excitation by IR Laser Diodes in the Active BaY_(2)F_(8):Yb~(3+),Pr~(3+) Medium

摘要

The possibilities of occupying high-lying 4f states of Pr~(3+) ions in the active BaY_(2)F_(8):Yb~(3+),Pr~(3+) medium according to the photon avalanche and step-by-step sensitization mechanisms are compared. It is shown that the photon avalanche is unlikely to occur in the BaY_(2)F_(8):Yb~(3+),Pr~(3+) crystal. The multiband luminescence spectra in the visible spectral range (white emission) under single- and multiwave pumping of BaY_(2)F_(8):Yb~(3+),Pr~(3+) crystal by IR laser diodes are reported.