LiYF4 nanocrystals (NCs) doped with 1% and 10% of Yb3+ and capped with oleic-acid were synthesized via a previously reported and modified co-precipitation method. Size, morphology, composition, and colloidal stability of these NCs are reported with data obtained from TEM, XRD, TGA/DSC, XRF, and zeta potential techniques. TEM analysis shows a monodisperse size distribution, with the nanocrystal size of ~20 nm. Optical characterization is described using data collected from UV-Vis-NIR absorption spectrophotometry and photoluminescence spectroscopy. The excellent luminescence in the NIR-II spectral region makes these NCs potential candidate for bioimaging applications.
We have successfully synthesized lithium yttrium fluoride (YLF) nanocrystals doped with ytterbium. The Yb content was varied between 1% and 10%. The nanocrystals emit in near-infrared, with the emission spectrum extending from 960 nm to 1060 nm when excited with the 900 nm light. Strong anti-Stokes photoluminescence was observed when using excitation wavelengths ranging from 1010 nm to 1020 nm. The temperature-dependence of the anti-Stokes photoluminescence was measured over the range from 10 °C till 70 °C. These nanocrystals have a high potential to be used in optical cooling applications.
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