In recent years, rare earth-doped upconversion(UC) micro/nanocrystals are useful for many applications, especially in biology because of their unique luminescent properties and specific geometry. The luminescence efficiency of lanthanidedoped UC nanoparticles is of particular importance for their applications. However, the unsatisfactory UC efficiency is still one of the main hurdles. In the present article, a series of Yb~(3+)/Er~(3+) doped NaYF_4 micro/nanoparticles with different ratios of length to diam...
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