Er3+ and La3+ codoped Y2O3 nanocrystalline powders were synthesized by gel combustion method and characterized with thermal analysis, X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM) techniques and fluorescence spectroscopy. After being calcined at 1200 oC, the (Y1–xLax)2O3:Er3+ powders were confirmed to be cubic Y2O3 phase with the crystalline grain size in the range of 20–40 nm. The Er3+ emission at 1.53μm from the4I13/2→4I15/2 transition was observed, which was found to be enhanced by introducing La3+ ions. Such enhancement could be attributed to the adjustment of Er3+ ions’ local environment by the codoping of La3+ ions, leading to the increased ground state absorption cross section of Er3+ ions.
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