In this study,α-TeO2:Ho3+/Yb3+,α-TeO2:Eu3+ andα-TeO2:Ho3+/Yb3+/Eu3+ nanoparticles were prepared via a simple hydrothermal process. The up- and down-conversion properties of the as-prepared nanoparticles were tested at room temperature un-der a near-infrared photo source (980 nm) and UV-vis photo source, respectively.The results indicated thatα-TeO2 NPs were a kind of outstanding host material for both up- and down-conversion luminescence. Theα-TeO2:Ho3+/Yb3+nanoparticles showed sharp up-conversion emission at 545 and 660 nm under 980 nm excitation, ascribed to the5S2→5I8 and5F5→5I8(Ho3+) transitions, and weaker down-conversion emission at 545 nm under 455 nm excitation, ascribed to the5S2→5I8(Ho3+) transitions. Theα-TeO2:Eu3+nanoparticles showed strong down-conversion emission at 592 and 615 nm under 395 nm excitation, attributed to the5D0→7F1 and 5D0→7F2 (Eu3+) transitions. Possessing the advantages of these two luminescent materials, the as-prepared tri-doped samples ofα-TeO2:0.5Ho3+/10Yb3+/3Eu3+ (mol.%)nanoparticles could successfully emit visible light via both up- and down-conversion modes.
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