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Efficient infrared-to-visible conversion by Er 3+ /Yb 3+ -codoped PbTiO 3 perovskite will be reported. The process is observed under 980 nm laser diode (GaAs:Si) excitation and results in the generation of green ($555 nm) and red ($655 nm) emission. The main mechanism that allows for up-conversion is attributed the energy transfer among Yb and Er ions in excited states. The power up-conversion efficiency for red emission is predominant in this material. The results illustrate the large potential of this new class of material for photonic applications involving optoelectronics devices. #

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