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4. Conclusions
The upconversion white luminescence of TeO2:Tm3+/Er3+/Yb3+
nanoparticles were investigated in the present work. The as-
prepared TeO2:Tm3+/Er3+/Yb3+ nanoparticles showed the blue
(476 nm), green (525 nm, 545 nm) and red (667 nm) emissions
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This work was supported by National Natural Science Founda-
tion of China (21075053). We thank Professor Qinyuan Zhang at
South China University of Technology for his assistance in lumi-
nescence decay curves detection.