The role of Li+ in the upconversion emission enhancement of (YYbEr)2O3 nanoparticles
Li+-doped (Y0.97−xYb0.02Er0.01Lix)2O3 nanoparticles, x = 0.000–0.123, are prepared by a solid-state reaction; Li+-induced upconversion enhancement is quantitatively assessed.
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