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Er3+ doped and Er3+–Yb3+ co-doped ZnO–WO3–B2O3–SiO2 glass-ceramics have been prepared by melt-crystallization method and their properties are examined by differential scanning calorimetry (DSC), scanning electron microscopy (SEM), X-ray diffractometry (XRD) and fluorescence spectroscopy. The results reveal that Er3+ ions or Er3+–Yb3+ ions have already entered into the crystalline field. The up-conversion...
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