Hydrothermal synthesis and site symmetry tuning of polycrystalline YVO4: Eu nanoparticles via a continuous-flow microreactor.

07:00 EST 13th February 2020 | BioPortfolio

Summary of "Hydrothermal synthesis and site symmetry tuning of polycrystalline YVO4: Eu nanoparticles via a continuous-flow microreactor."

Yttrium orthovanadate (YVO4) has been widely used as a host material for low- and medium-power diode-pumped solid-state lasers due to its excellent thermal, mechanical, and optical properties. This work demonstrates the synthesis and site symmetry tunning of polycrystalline YVO4: Eu nanoparticles with uniform size and shape using a continuous-flow microreactor at high pressures. High-quality YVO4: Eu nanoparticles were created using a residence time of fewer than 20 seconds. Carefully controlling the heat flux and flow rate can produce the YVO4: Eu nanoparticles showing different crystallinity, crystal morphologies, site symmetry around Eu3+, and therefore optical emission. The site symmetry of YVO4: Eu is adjusted without any stoichiometric modification of the precursors by simply varying the flow rate and heat flux of the microreactor. The site symmetries of the as-synthesized YVO4: Eu nanoparticles are studied by investigating their photoluminescent emission spectra and computational model of first-principle density functional theory (DFT). The DFT model indicates that the oxygen vacancy influenced the V-O association and the overlap between Eu 4f and V 3d states which can contribute to different optical transitions and, therefore, distinct emission spectrum. The use of a continuous flow microreactor at high pressure provides better understandings of the hydrothermal syntheses of functional nanoparticles and enables scalable manufacturing concurrently.


Journal Details

This article was published in the following journal.

Name: Nanotechnology
ISSN: 1361-6528


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