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

Publication Type:
Journal Article
Citation:
Journal of Materials Chemistry C, 2015, 3 (2), pp. 364 - 369
Issue Date:
2015-01-14
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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-NaYF 4 : Yb 3+ -Tm 3+ individual nanocrystals benefiting from the perfect ladder-type electron configuration of Tm 3+ 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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