Abstract
The crystalline fraction were adjusted MgO concentration and the corresponding effect on upconversion (UC) luminescence in Er3+/Yb3+ co-doped NaYF4 oxyfluorode glass-ceramics was investigated. With increase of MgO and the content of Na2O reduced, the internal network structure of the glass became compact, which made the size of NaYF4 nanocrystals unchanged, while the average distance between the nanocrystals increased significantly. Crystal growth is limited with the glass network, keeping the crystal size not changed. SNM-1 glass ceramics samples show a predominant red up-conversion emission under near infrared excitation at 980nm, while a predominant green emission is observed in the SNM-3 samples. In this paper, it was indicated that it changed the effect of glass network modifier MgO in the glass structure. The possible mechanism responsible for the color variation of UC in Er3+/Yb3+ co-doped was discussed.
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