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In this paper we demonstrate visible up-conversion emission of Er 3+  doped (Lu 0.5 Y 0.5 ) 2 O 3  nanophosphor and discuss possible mechanisms for pumping the upper energy levels of Er 3+  ions. Polymer complex solution synthesis yields well crystalline, pure-phase cubic nanopowder with particle size in the 20–50 nm range. Red, green and blue up-conversion emission is measured under near-infrared excitation (1 540 nm), over the temperature range 10–300 K. The red/green intensity ratio indicates that the mechanism responsible for populating red up-conversion is temperature dependent. Decay times are found to be around 0.25 ms for red and green, and around 70 μs for blue emission.

Processing and characterization of up-converting Er 3+ doped (Lu 0.5 Y 0.5 ) 2 O 3 nanophosphor