Nano ceramics of pure TiO 2 and Dy 3+ , Eu 3+ and Tb 3+ doped TiO 2 are prepared by hydrothermal method and these are characterized by using X-ray diffractometer (XRD), UV-Visible spectroscopy, field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), and photoluminescence spectroscopy. XRD analysis revealed that the average particle size of the pure TiO 2 and Dy 3+ , Eu 3+ and Tb 3+ doped TiO 2 are in the range of 45-35 nm and confirms the anatase phase. The FESEM and HRTEM analysis confirm that the obtained ceramics are in nano regime. The absorption spectrum revealed that the bandgap of the TiO 2 ceramics are in the range 3.14-3.2 eV. The PL analysis showed that the doping of Dy 3+ , Eu 3+ and Tb 3+ had improved the luminescence behavior than the pure TiO 2 nanoparticles. Overall, by doping 0.5 mol% concentration of rare earth (RE) greatly alters the structural morphology and directly influence the luminescence behavior of TiO 2 and suitable for advanced optoelectronic applications. The color purity of the studied samples is found to be 91% for Dy 3+ , 84% for Eu 3+ and 73% for Tb 3+ at the excitation of 345 nm, 376 nm and 350 nm respectively. The single-doped sample Eu 3+ : TiO 2 , Tb 3+ : TiO 2 and Dy 3+ : TiO 2 samples showed orange-red, blue-green and white emissions respectively.
Metal oxides are useful materials that have various applications in advanced field such as, in view of their different properties, hardness, thermal dependability and compound resistance. Novel utilizations of the nanostructures of these oxides are drawing in critical enthusiasm as new preparation process are created and new structures are described. Hydrothermal synthesis is a fruitful procedure to prepare different sensitive structures of metal oxides on the scales from a couple to several nanometres, particularly, the hugely scattered middle structures which are hardly through pyropreparation.Titanium dioxide nanocrystals are synthesis by a hydrolysis procedure of metatitanic acid. Nano precious crystal of different sizes is procure in the after calcinations from 150 to 225 o C. Raman scattering was utilized to examine the advancement of the anatase stage in the nano crystal during calcinations.
TiO2:Sm 3+ (1-9 mol %) nano particles (NPs) were prepared by self-propagating solution combustion method (SC) using Neem leaf extract. PXRD study contributes the particle size, crystallanity etc., with phase transformation from rutile to anatase with the addition of dopant when calcinated for 2H. The energy band gap (Eg) of pure and doped samples was found to be in the range 3.10 -3.23 eV. The Photo-luminescence points CIE and CCT results with chromaticity colour CIE-coordinates x = 0.5310, y = 0.4601 and average CCT as 2426K, suggests sample suitable for hot wLEDs which can be used for household applications.
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