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Lanthanide ion‐pair (Eu3+/Tb3+, Dy3+/Tb3+, Sm3+/Tb3+ and Eu3+/Dy3+) codoped NaGdF4 nanocrystals using Ce3+ as the sensitizer were prepared via the polyol method. The nanocrystals with different codoped lanthanide ion‐pairs retain their individual optical properties and the combined spectra can be detected using single‐wavelength excitation at about 251 nm. The combined spectra intensity ratios can...
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