Abstract
Up-conversion (UC) luminescence in hafnia powder (HfO2) doped with Er3+, Yb3+ and Li+ was studied under continuous wave excitation at 980nm. Powder samples were prepared by the simple evaporation technique and incorporated into polyester films (by spin coating technique). They were characterized using x-ray diffraction, electron microscopy, IR spectroscopy and UV–vis. A study of UC emission from Er3+ ions was performed including the analysis of the spectral and temporal behavior. The effect of Yb3+ co-doping concentration was found to change the intensity ratio of the Er3+ green and red characteristic emissions which allows for a color tuning of the UC emission. The mechanisms contributing to the UC luminescence are discussed as well.
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