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Published April 28, 2014 | Published + Accepted Version
Journal Article Open

Photoluminescence spectroscopy of YVO_4:Eu^(3+) nanoparticles with aromatic linker molecules: A precursor to biomedical functionalization

Abstract

Photoluminescence spectra of YVO_4:Eu^(3+) nanoparticles are presented, with and without the attachment of organic molecules that are proposed for linking to biomolecules. YVO_4:Eu^(3+) nanoparticles with 5% dopant concentration were synthesized via wet chemical synthesis. X-ray diffraction and transmission electron microscopy show the expected wakefieldite structure of tetragonal particles with an average size of 17 nm. Fourier-transform infrared spectroscopy determines that metal-carboxylate coordination is successful in replacing native metal-hydroxyl bonds with three organic linkers, namely, benzoic acid, 3-nitro 4-chloro-benzoic acid, and 3,4-dihydroxybenzoic acid, in separate treatments. UV-excitation photoluminescence spectra show that the position and intensity of the dominant ^5D_0 – ^7F_2 electric-dipole transition at 619 nm are unaffected by the benzoic acid and 3-nitro 4-chloro-benzoic acid treatments. Attachment of 3,4-dihydroxybenzoic acid produces an order-of-magnitude quenching in the photoluminescence, due to the presence of high-frequency vibrational modes in the linker. Ratios of the dominant electric- and magnetic-dipole transitions confirm infrared measurements, which indicate that the bulk crystal of the nanoparticle is unchanged by all three treatments.

Additional Information

© 2014 AIP Publishing LLC. (Received 20 February 2014; accepted 18 April 2014; published online 29 April 2014) This research was sponsored by an Award for Research Team Scholarship from the Eberly College of Arts and Science at West Virginia University. S.K.C. was supported by NSF Research Graduate Fellowship (No. 1102689). We acknowledge use of the WVU Shared Research Facilities.

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Created:
August 20, 2023
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