Y2O3:Er3+, Yb3+ nanoparticles are prepared by laser ablation on the oxide mixture.
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Number of carbonate and hydroxyl groups in the nanoparticles is decreased.
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These nanoparticles present improved emission properties.
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For the first time, infrared emission at 1550 nm is almost suppressed.
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Mechanisms are explained in terms of reduced nonradiative relaxation.
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