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Heavy metal glasses doubly doped with Yb3+and Ln3+ions (Ln=Er or Tm) were studied. Glass host matrices were limited to lead borate glass and lead germanate glass. Efficient resonant (Yb3+-Er3+) and non-resonant (Yb3+-Tm3+) energy transfer was ob-served for the studied systems. Near-infrared luminescence spectra at 1.53μm (Er3+) and 1.9μm (Tm3+) were detected under excita-tion of Yb3+by 975 nm diode laser line. They corresponded to 4I13/2→4I15/2 (Er3+) and 3F4→3H6 (Tm3+) transitions of rare earth ions, respectively. The unusual large spectral linewidth nearly close to 110 nm for 4I13/2→4I15/2 transition of Er3+ions in lead borate glass was obtained, whereas long-lived near-infrared luminescence at 1.53μm was detected in lead germanate glass. Quite different situa-tion was observed for Yb3+-Tm3+doubly doped glasses. In contrast to lead borate glass, near-infrared (3F4→3H6) luminescence spectra were registered for Tm3+ions in lead germanate glasses, only. These phenomena strongly depended on stretching vibrations of glass host, which was confirmed by FT-IR spectroscopy.

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