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Under a 980 nm laser pumping, quenching of green upconversion (UC) emission accompanied with enhancement of red UC emission observed was dominated by the energy back-transfer (EBT) process in Er3+ and Yb3+ co-doped PbTiO3, BaTiO3, and SrTiO3 polycrystalline powders. The efficiency of the EBT process depends not only on Yb3+ concentration but also on level match of the doped Er3+ and Yb3+ ions caused...
Calculating the electronic structure and the density of states in the wurtzite structure of Zn1−xMgxO (ZMO) alloys using sp3 semi-empirical tight-binding model, we observed increases of both band gap and electron effective mass that agree with the experimental results as increasing Mg composition up to x=0.3. From the calculated total density of states, the increasing...
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