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Thai, Dang Van
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article
Preparation and Characterization of Gd₂O₃: Er³⁺ Nanosphere Particles Combinated with Chitosan Gd₂O₃: Er³⁺@CS
Abstract
<jats:p>Nanospherical upconversion luminescence particles (UCLPs) Gd<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>:Er<jats:sup>3+</jats:sup> and Gd<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>:Er<jats:sup>3+</jats:sup>@ chitosan (CS) were prepared by step-by-step precipitation and calcination of the available nitrate rare Earth sales and chitosan. The morphology and composition of as-prepared samples were characterized by field emission electron spectroscopy (FESEM) and Fourier transform infrared (FT-IR) spectroscopy. The synthesized UCLPs were non-agglomerate spheres in uniform nanoscale. The quantitative amount of chitosan was well coated with the gain surface of the UCLPs Gd<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>:Er<jats:sup>3+</jats:sup> to obtain Gd<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>:Er<jats:sup>3+</jats:sup>@CS nanocomposite. The down-conversion luminescent intensity of Gd<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>:Er<jats:sup>3+</jats:sup> NSP is lower than Gd<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>:Er<jats:sup>3+</jats:sup>@CS NSP samples, but luminescent characterizations were non-change. The photoluminescence (PL) of the green emission range of all UCLPs samples with chitosan-coated and -uncoated took the leading position. By using a diode laser excitation with 975 nm of wavelength, the detected intensity of red emission is more remarkably detected than green emissions. The two-photon mechanism for both green and red emissions of nanophosphor was observed. As a result, these might be promising opportunities to conjugate with various bio subjects that could be used in medical applications.</jats:p>