17 February 2017 Laser refrigeration of rare-earth doped sodium-yttrium-fluoride nanowires
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Hexagonal sodium yttrium fluoride (β-NaYF4) crystals are currently being studied for a wide range of applications including color displays, solar cells, photocatalysis, and bio-imagβing. β-NaYF4 has also been predicted to be a promising host material for laser refrigeration of solids. However, due to challenges with growing Czochralski β- NaYF4 single-crystals, laser refrigeration of bulk β-NaYF4 has not yet been achieved6. Recently hydrothermal processing has been reported to produce Yb-doped β-NaYF4 nanowires (NWs) that undergo laser refrigeration during single-beam optical trapping experiments in heavy water. The local refrigeration of the individual nanowire is quantified through the analysis of its Brownian motion through the analysis of forward scattered light that is focused onto a quadrant photodiode. The individual β-NaYF4 nanowires show maximum local cooling of 9°C below ambient conditions. Here we present the emission lifetime for the 4S3/24I15/2 transition for Er(III) ions in Yb/Er-codoped -NaYF4 NW ensembles was measured to be (220 ± 6) μs using a an electron multiplying charge coupled device (EMCCD) as a detector with high spatial resolution. This lifetime is consistent with values reported in the literature.
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Xuezhe Zhou, Xuezhe Zhou, Paden B. Roder, Paden B. Roder, Bennett E. Smith, Bennett E. Smith, Peter J. Pauzauskie, Peter J. Pauzauskie, } "Laser refrigeration of rare-earth doped sodium-yttrium-fluoride nanowires", Proc. SPIE 10121, Optical and Electronic Cooling of Solids II, 1012103 (17 February 2017); doi: 10.1117/12.2253568; https://doi.org/10.1117/12.2253568

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