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- W2022792086 abstract "Efficient upconversion of photoluminescence from donor-bound excitons is revealed in bulk and nanorod ZnO. Based on excitation power-dependent PL measurements performed with different energies of excitation photons, two-photon absorption (TPA) and two-step TPA (TS-TPA) processes are concluded to be responsible for the upconversion. The TS-TPA process is found to occur via a defect/impurity (or defects/impurities) with an energy level (or levels) lying within 1.14–1.56 eV from one of the band edges, without involving photon recycling. One of the possible defect candidates could be VZn. A sharp energy threshold, different from that for the corresponding one-photon absorption, is observed for the TPA process and is explained in terms of selection rules for the involved optical transitions." @default.
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- W2022792086 date "2012-09-01" @default.
- W2022792086 modified "2023-10-11" @default.
- W2022792086 title "Efficient upconversion of photoluminescence via two-photon absorption in bulk and nanorod ZnO" @default.
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- W2022792086 doi "https://doi.org/10.1007/s00340-012-5138-y" @default.
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