Abstract
The Tm3+ 800nm upconversion emission corresponding to the 3H4→3H6 transition has been obtained upon infrared sub-Si bandgap excitation at 1210nm in Tm3+ doped transparent glasses and glass ceramics with composition SiO2–Al2O3–CdF2–PbF2–YF3. Possible energy transfer mechanisms have been carefully studied through different experimental measurements such as the excitation spectrum, decay rate of the emission and laser pump power versus integrated emission. The results suggest that energy transfer upconversion (ETU) mechanism is responsible for the emission. It is based on the following process: Tm3+(3F4)+Tm3+(3F4)→Tm3+(3H6)+Tm3+(3H4). The upconverted emission is about three times more intense in the glass ceramic samples than in the precursor glasses. This emission can be used to enhance the performances in crystalline silicon (c-Si) solar cells.
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