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STED Nanoscopy Goes Low Power

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1 STED Nanoscopy Goes Low Power
Liangliang Liang, Xiaogang Liu  Chem  Volume 2, Issue 3, Pages (March 2017) DOI: /j.chempr Copyright © 2017 Elsevier Inc. Terms and Conditions

2 Figure 1 Photon-Avalanche-Mediated STED in Upconversion Nanoparticles Highly Doped with Tm3+ Schematic showing the effect of the combined action of 980 nm excitation and 808 nm depletion on upconversion luminescence. A high doping concentration of activators leads to drastically shortened distance and thus strong cross-relaxation between neighboring Tm3+ ions, resulting in photon avalanche and population inversion between the 3H4 and 3H6 states. Therefore, the amplified stimulated emission caused by the 808 nm beam can deplete the 3H4 state and switch off the upconversion emission efficiently. (The plot legend schematically refers to the population density of the Tm3+ activator.) Chem 2017 2, DOI: ( /j.chempr ) Copyright © 2017 Elsevier Inc. Terms and Conditions

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