OSE Distinguished Faculty Member, Dr. Marek Osinski Presents Two Papers at Photonics West 2022

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Posted: January 25, 2022

The OSE Program at Photonics West 2022

OSE Distinguished Faculty Member, Dr. Marek Osinski Presents Two Papers at Photonics West 2022

Colloidal synthesis and characterization of ytterbium-doped YLF nanocrystals

We report on first colloidal synthesis of ytterbium-doped yttrium lithium fluoride (YLF) nanocrystals. The relative amounts of Yb and Y were adjusted to obtain different concentrations of Yb between 1% and 15%. The structure and morphology of these nanocrystals were studied via transmission electron microscopy, x-ray diffraction, and x-ray fluorescence. The nanocrystals were optically characterized by absorption and extensive photoluminescence studies, including Stokes and ant-Stokes emission. When excited with a 900-nm light, the nanocrystals emit in near infrared (NIR) emission, from 960 nm to 1060 nm. This is a useful window for biological studies, such as imaging in the NIR regime.

Anti-Stokes photoluminescence from LiY1-xYbxF4 nanocrystals

We have successfully synthesized lithium yttrium lithium fluoride (YLF) nanocrystals doped with ytterbium. The Yb content was varied between 1% and 10%. TEM analysis shows a monodisperse size distribution, with the nanocrystal size of ~20 nm. 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.

Link to Photonics West 2022 Program: https://spie.org/conferences-and-exhibitions/photonics-west

Link to Upcoming 2022 Optics Conferences: https://optics.unm.edu/conferences/conference-2022.html