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This letter presents the optical and spectroscopic properties of a new low-energy phonon, moisture-resistant and non-linear Pr3+:Tl3PbBr5 single crystal. Though only weakly doped with Pr3+ ions, centimetre-size and good-quality single crystals could be grown and analyzed. Absorption and emission spectra as well as fluorescence kinetics were registered in the mid-infrared spectral domain. Strong luminescence...
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