Abstract
Luminescence characteristics of Yb 3+, La 3+ codoped yttrium oxide nanopowders were investigated. The grain size and the crystallinity of (Yb 0.05Y 0.90La 0.05) 2O 3 nanopowders increase with the increase of calcination temperature. The average grain size of the nanopowders calcined at 1100 °C is 66 nm and its cooperative up-conversion luminescence centered at 498 nm was detected due to nanometer size effect and perfect crystallinity. However, the cooperative up-conversion luminescence of (Yb 0.05Y 0.90La 0.05) 2O 3 transparent ceramics was not detected.
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