Laser Refrigeration of Ytterbium-Doped Sodium-Yttrium-Fluoride Nanowires

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

doi:10.1002/adma.201600406

Laser Refrigeration of Ytterbium-Doped Sodium-Yttrium-Fluoride Nanowires

Adv Mater. 2016 Oct;28(39):8658-8662. doi: 10.1002/adma.201600406. Epub 2016 Aug 12.

Authors

Xuezhe Zhou¹, Bennett E Smith², Paden B Roder¹, Peter J Pauzauskie^{3

4}

Affiliations

¹ Department of Materials Science & Engineering, University of Washington, Seattle, WA, 98195, USA.
² Department of Chemistry, University of Washington, Seattle, WA, 98195, USA.
³ Department of Materials Science & Engineering, University of Washington, Seattle, WA, 98195, USA. peterpz@uw.edu.
⁴ Fundamental & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA. peterpz@uw.edu.

PMID: 27514650
DOI: 10.1002/adma.201600406

Abstract

Sodium yttrium fluoride (β-NaYF₄ ) nanowires (NWs) with a hexagonal crystal structure are synthesized using a low-cost hydrothermal process and are shown to undergo laser refrigeration based on an upconversion process leading to anti-Stokes (blueshifted) photoluminescence. Single-beam laser trapping combined with forward light scattering is used to investigate cryophotonic laser refrigeration of individual NWs through analysis of their local Brownian dynamics.

Keywords: NaYF4; anti-Stokes; lasers; nanowires; refrigeration; solid-state.