Abstract
A series of high-purity Er0.05Y1.95O3 nanopowders with different lanthanum content was prepared by modification of the Pechini sol–gel method using citric acid and ethylene glycol as the chelating agent. The microstructure of the powders was studied by means of X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy. In order to evaluate the structural characteristics of the obtained gel, XRD measurements were carried out with calcination gels in selected temperatures. Simultaneous differential thermal analysis with thermal gravimeters indicates a decrease of calcination temperature with an increasing content of lanthanum ions. Morphological properties of the nano-sized powders were examined by scanning electron microscopy. Strong luminescence in near IR region was observed under 980 nm excitation at room temperature. By varying the concentration of La3+ ion, various intensities of upconversion luminescence can be easily achieved.
Highlights
New types of optical devices, such as high-energy laser, optical fiber amplifiers, and optical rotators, have attracted significant attention due to their unique physical properties
Many papers have indicated that the doping of Y2O3 with erbium ions allows for luminescence emission in the infrared range [3, 14]
This paper focuses on the development of high clean Lax:Er0.5Y1.95-xO3 nanopowders with doping concentration varied from 0 to 0.1 mol
Summary
New types of optical devices, such as high-energy laser, optical fiber amplifiers, and optical rotators, have attracted significant attention due to their unique physical properties. Numerous studies conducted far indicate that the choice of preparation method influences the size, shape, and crystalline structure of powders, which determine optical, transmittance, and luminescence properties of sinters [1,2,3,4,5]. Many papers have indicated that the doping of Y2O3 with erbium ions allows for luminescence emission in the infrared range [3, 14].
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