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TEM image of nanocrystals doped with and .
(Color online) Tailored luminescence spectra of nanocrystals (a) doped with and (b) doped with and . The two peaks are normalized to a constant value.
(Color online) Energy level diagram of and ions as well as the proposed mechanisms to produce UC spectra.
(Color online) Luminescence spectra of nanocrystals (a) doped with and and (b) doped with and .
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