Wang J.,Shandong Labour Vocation and Technology College
Ferroelectrics | Year: 2015
The Y2O3:Eu3+ nano-phosphors were synthesized by coprecipitation with the addition of oleic acid. The XRD pattern and TEM images show that the obtained Y2O3:Eu3+ samples are spherical nanoparticles with the body centered cubic structure. Upon excitation into the CTB of Eu3+ ions at 266 nm, Y2O3:Eu3+ samples show the characteristic emission spectra of Eu3+ ions originating from the 5D0 → 7Fj transitions. The corresponding luminescence decay times can be fitted well with a single exponential decay curve. The emission intensity increases with the increase of Eu3+ doped concentration, but the luminescence lifetime is just opposite to it. © 2015 Copyright © Taylor & Francis Group, LLC.
Ge R.,University of Jinan |
Wang Q.,Shandong University |
Shang X.,Shandong Labour Vocation and Technology College
Advanced Materials Research | Year: 2011
The roller gear cam surface is often machined by the unequal diameter manufacture method, which means the tool diameter is smaller than that of the roller and the tool position compensation method is most used. For tool position of roller gear cam, it is important to confirm the compensation vector for the tool position compensation method, including compensation value and direction. In the paper, a new self-adaptive tool position optimization method is proposed, which make minimizing the normal machining error as the object function and make two compensation factors as the optimization variables. This algorithm can find out the best compensation direction and value by the tool position optimization for any cam rotation angle and make the tool position self-adaptive and flexible compensation according to the machining error. A numerical calculation example shows that the optimization algorithm can feasibly reduce the machining error. At last a conclusion has been drawn that the radius difference between the tool and the roller is the best compensation value and the best compensation direction is not fixed. © (2011) Trans Tech Publications Switzerland.
Lu X.,Shandong Labour Vocation and Technology College
Journal of Materials Science: Materials in Electronics | Year: 2014
Bi0.95Eu0.05PO4 nanocrystals with different morphologies were synthesized by precipitation in different solvents. The Bi0.95Eu0.05PO4 samples were characterized by X-ray powder diffraction, scanning electron microscopy (SEM), and luminescence spectroscopy. The X-ray diffraction results reveal that the Bi 0.95Eu0.05PO4 samples present a hexagonal phase. The SEM observations demonstrate that the Bi0.95Eu 0.05PO4 samples with different morphologies could be obtained in different solvents. The room temperature luminescent properties of Bi0.95Eu0.05PO4 samples were studied using an excitation wavelength of 290 nm. The emission spectra display the bands associated to the 5D0 → 7FJ electronic transitions characteristics of the Eu3+ cations at different positions. © 2013 Springer Science+Business Media New York.
Zhang S.,Shandong Labour Vocation and Technology College |
Yang Y.,Shandong Academy of Sciences
Journal of Electronic Materials | Year: 2014
In this study, BiPO4:Eu3+ phosphors were synthesized by a facile hydrothermal route at different temperatures. The BiPO 4:Eu3+ particles were characterized by x-ray powder diffraction (XRD), infrared spectra, and luminescence spectroscopy. The XRD results reveal that the BiPO4:Eu3+ particles present different phases for different hydrothermal temperatures. It is found that a hexagonal phase is formed at 100 C, which transforms to a low-temperature monoclinic phase (MP) when the hydrothermal temperature is increased to 150 C. This low-temperature MP transforms to high-temperature MP when the temperature is increased beyond 200 C. The luminescent properties of the BiPO 4:Eu3+ particles were studied using an excitation wavelength of 270 nm. The emission spectra display the bands associated with the 5D0 → 7F J (J = 1, 2, 3, and 4) electronic transitions of the Eu3+ cations. The intensity of the emission spectra increases with increasing hydrothermal temperature. These results demonstrate that BiPO4:Eu3+ with different phases can be obtained through the hydrothermal method, which may enrich the solution chemistry for preparation of advanced materials with tailored functionality. © 2013 TMS.