Abstract
Ho/Yb co-doped Bismuth boro-tellurite glasses were synthesized by conventional melt-quench methods. Thermal properties of the prepared samples were carried by differential scanning calorimetry. UV–VIS-IR absorption spectra were studied for the calculation of forbidden energy gap and refractive index of prepared glasses. For the study of photoluminescence samples were excited by 980 nm laser diode, intense green and red emissions were detected easily even by naked eyes. The observed intense red emission is thought to be caused by a combination of excited state absorptions between different levels of Ho ions and cooperative energy transfer upconversion from a pair of Yb donor ions to one Ho acceptor ion, in addition to the usual direct energy transfer process from Yb3+ to Ho3+.
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