Abstract
We reported the upconversion luminescence (UCL) properties of Er3+-Yb3+ co-doped BiOCl semiconductor nanosheets synthesized by hydrothermal method. Under 980nm excitation, the red and green UCL of Er3+ ions were observed to be populated by a four and three-photon process in the case of absent or low concentration Yb3+ dopant. However, an increase of Yb3+ dopants show a completely opposite effect on the emission intensity of red and green one, accompanying with the change of upconverting process. It indicates that the red-shifting absorption edge of semiconductor and the super saturation UC processes involved with Yb3+ and Er3+ doping in BiOCl semiconductor nanosheets, respectively, are mainly responsible for the above UC phenomena.
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