Abstract
Highly crystalline, luminescent YPO4:Tb (core), YPO4:Tb@LaPO4 (core/shell) nanorods (NRs) were prepared by urea based co-precipitation process at low temperature. The synthesis method involves important advantages such as its simplicity, low-cost precursor, eco-friendly, rapidness and high reaction yields. X-ray diffraction, transmission electron microscopy, energy dispersive-x-ray analysis, FTIR, UV/vis, excitation and emission spectral techniques were employed to investigate the crystals structure, crystallinity, morphology, surface chemistry, optical and photoluminescence properties of the as-prepared samples. The silica surface coating was verified from EDX and FTIR spectral studies. TEM micrograph indicates the well crystalline, irregular size rod-shaped nanostructures, which were covered with a porous thin silica layer. The emission spectra were dominated by a 5D4→7F5 transition in all three samples, but the core/shell nanostructured shows strongest emission intensity because of reduction in nonradiative transition rate. Silica-modified core/shell/Si NRs exhibits high solubility with good colloidal stability in respect to core/shell NRs due to the influence of optically active silica. The morphological, nanostructural, high solubility in an aqueous solvent along with strong green photoluminescence makes them a suitable candidate for biomedical applications.
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