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Lead borate glasses doubly doped with Dy 3+ –Tb 3+ and Tb 3+ –Eu 3+ were investigated using optical spectroscopy. Luminescence spectra of rare earths were detected under various excitation wavelengths. The main green emission band due to 5 D 4 → 7 F 5 transition of Tb 3+ is observed under excitation of Dy 3+ , whereas...
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