Search for: [Abstrakt = "Oxyhalide lead borate glasses doped with rare earth ions have been studied before and after thermal treatment. The rare earths as optically active ions were limited to the Er3\+ ions. Near\-infrared luminescence due to the main 4I13\/2–4I15\/2 laser transition of Er3\+ was registered. The introduction of PbX2 to the borate glass results in a reduction of spectral linewidth and an increase of luminescence lifetime of 4I13\/2 state of Er3\+ ions. The unusual large spectral linewidth for 4I13\/2–4I15\/2 transition of Er3\+ in the oxide glass host was obtained, whereas the luminescence decay from 4I13\/2 state is longer for a sample with PbF2 than PbCl2 and PbBr2. Heat treatment introduces transformation from a glass to transparent glass\-ceramic \(TGC\). The coordination sphere around Er3\+ ions is changed, giving important contribution to the luminescence characteristics. The spectroscopic consequence of this transformation is the increase of luminescence lifetime and the narrowing of spectral lines of Er3\+."]

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