Laser refrigeration of rare-earth doped sodium-yttrium-fluoride nanowires

Xuezhe Zhou; Paden B. Roder; Bennett E. Smith; Peter J. Pauzauskie

doi:10.1117/12.2253568

17 February 2017 Laser refrigeration of rare-earth doped sodium-yttrium-fluoride nanowires

Xuezhe Zhou, Paden B. Roder, Bennett E. Smith, Peter J. Pauzauskie

Proceedings Volume 10121, Optical and Electronic Cooling of Solids II; 1012103 (2017) https://doi.org/10.1117/12.2253568
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

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 ⁴S_3/2 – ⁴I_15/2 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.

Citation Download Citation

Xuezhe Zhou, Paden B. Roder, Bennett E. Smith, and 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); https://doi.org/10.1117/12.2253568

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KEYWORDS

Ions

Nanowires

Luminescence

Crystals

Electron multiplying charge coupled devices

Laser crystals

Erbium

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