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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
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Characterising energy transfer upconversion in Nd-doped vanadates at elevated temperatures.

S Cante, S J Beecher, J I Mackenzie

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    |April 4, 2018
    PubMed
    Summary

    This study measured Energy Transfer Upconversion (ETU) in Nd-doped YVO4 and GdVO4 crystals. Results show decreased absorption cross-section and ETU coefficients with increasing temperature.

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    Area of Science:

    • Materials Science
    • Solid-State Physics
    • Laser Technology

    Background:

    • Neodymium-doped vanadates (Nd:YVO4, Nd:GdVO4) are crucial laser materials.
    • Understanding temperature-dependent optical properties is vital for device performance.

    Purpose of the Study:

    • To investigate the temperature dependence of Energy Transfer Upconversion (ETU) in Nd:YVO4 and Nd:GdVO4.
    • To characterize the ground state absorption cross-section at elevated temperatures.

    Main Methods:

    • Automated z-scan technique for macroparameter measurement.
    • Temperature-controlled measurements from room temperature (RT) to 450K.
    • Characterization of 808 nm π-polarisation absorption cross-section.

    Main Results:

    • Absorption cross-section decreased with temperature for both Nd:YVO4 and Nd:GdVO4.
    • ETU coefficients also showed a decrease across the measured temperature range.
    • Specific values for absorption cross-section and ETU were quantified for different doping concentrations.

    Conclusions:

    • Temperature significantly impacts ETU and absorption properties in Nd-doped vanadates.
    • These findings are critical for designing high-power, temperature-stable solid-state lasers.
    • The z-scan technique provides an efficient method for such characterization.