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Yb/Er: Na3ZrF7 NCs with single-band upconversion emission are prepared by a facile co-precipitation method and their particle sizes are tuned by varying Yb3+ doping concentration. The UC emission intensity of 20Yb/2Er:Na3ZrF7@20Yb:Na3ZrF7 core/shell NCs increases ∼33 times in comparison with the 20Yb/2Er:Na3ZrF7 core NCs.
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