Zhou X1, Smith BE2, Roder PB1, Pauzauskie PJ3,4.
Adv Mater. 2016 Oct;28(39):8658-8662. doi: 10.1002/adma.201600406. Epub 2016 Aug 12.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.© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.