Enhanced Multiphoton Upconversion in Single Nanowires by Waveguiding Excitation

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Journal Article
Advanced Optical Materials, 2016, 4 (8), pp. 1174 - 1178
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40-Fold enhancement of upconversion luminescence in a single NaGdF4–LiF hybrid nanowire is reported, along with a series of unique characteristics. These include four-photon upconversion from Er3+:2P3/2 excited state, a low excitation power threshold, and high optical-imaging resolution by waveguiding excitation compared to free-space spot excitation.
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