Intense multiphoton upconversion of Yb<sup>3+</sup>-Tm<sup>3+</sup> doped β-NaYF<inf>4</inf> individual nanocrystals by saturation excitation

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Journal Article
Journal of Materials Chemistry C, 2015, 3 (2), pp. 364 - 369
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© The Royal Society of Chemistry 2015. Saturation excitation of individual nanocrystals represents a powerful strategy to explore unique optical characteristics of luminescent activators. Here we report the intense multiphoton upconversion of β-NaYF4: Yb3+-Tm3+ individual nanocrystals benefiting from the perfect ladder-type electron configuration of Tm3+ under saturation illumination excitation. This leads to a luminescence switching between the emissions from 2-photon upconversion and 4-photon upconversion, which exhibits significantly enhanced luminescence intensity by up to a factor of 70. Such intense multiphoton upconversion may have potential application in super-resolution imaging.
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