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Zhou X.,Jinggangshan University | Wang X.,Guangdong Technology Normal College

A facile chemical method was employed to prepare fine BiPO 4:Eu3+ phosphor particles calcined at the same temperature. Introducing lithium greatly affected the morphology of the samples and further affected the luminescence intensity. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectroscopy. The XRD patterns of BiPO 4:Eu3+ indicated a monoclinic phase. From the fluorescence spectra, the emission transition 5D0 → 7F1 is more prominent than the normal red emission transition 5D0 → 7F2. Based on the intensity ratios of 5D0 → 7F 2 to 5D0 → 7F1 in the emission spectra, it can be concluded that introducing Li+ can improve the symmetry of the crystal lattice and modify the emission intensity. Sharp lines at 395 nm are the strongest of the f-f transitions and match well with near-UV LED chips. Copyright © 2012 John Wiley & Sons, Ltd. Copyright © 2012 John Wiley & Sons, Ltd. Source

Zhou X.,Jinggangshan University | Wang X.,Guangdong Technology Normal College

Using anionic surfactant sodium dodecylbenzene sulfonate (SDBS), cationic surfactant cetyltrimethylammonium bromide (CTAB) and nonionic surfactant glyceryl monostearate (monostearin) respectively, Ca3(VO 4)2:Bi, Eu3+ red phosphors were prepared by a facile reaction chemistry method and their morphology, structure and luminescent properties were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD) and fluorescence spectrometer. The results showed that the introduction of surfactants not only greatly influenced their morphology, but also induced a remarkable change value of I615/I592. The reason that causes the variation of these properties for Ca3(VO 4)2:Bi, Eu3+ red phosphors was concluded to be related to different surfactants. © 2013 Elsevier GmbH. All rights reserved. Source

Zhou X.,Jinggangshan University | Wang X.,Guangdong Technology Normal College
Russian Journal of Physical Chemistry A

In this paper, Eu3+-doped Ca3(P x V 1 - x O4)2 (x = 0.1, 0.4, 0.7) nanophosphors were synthesized in the presence of sodium dodecyl benzene sulfonate (SDBS). The products present interesting and regular morphologies under the mild conditions. For Ca3(P x V1 - x O 4)2: Eu3+, they have the similar phase and their morphologies vary with the content ratio of P to V. Furthermore, the luminescence behavior of Eu3+ has been investigated in this one kinds of matrices. In Ca3(P x V1 - x O 4)2: Eu3+, the 5 D 0-7 F 2 emissions of Eu3+ were the strongest, indicating that the Eu3+ site is without inversion symmetry, the host compositions with different molar ratio of P to V have; great influence on the luminescent performance. Among those products, The value of I 615/I 593 for Eu3+ in Ca3(P 0.7V0.3O4)2 host lattice is the biggest. The substitution of PO 4 3- for VO 4 3- increase the ratio of surface Eu cations as well as the value of I 615/I 593 of Eu3+. © 2013 Pleiades Publishing, Ltd. Source

Wang X.-J.,Guangdong Technology Normal College | Xiao Z.-Y.,Jinggangshan University
Key Engineering Materials

With the use of virtual manufacturing technology, machine tool enterprise shortens the product design and manufacturing cycle, reduces the cost of the product development and improves the ability of the product in response to rapid changes in the market. With the use of the computer emulation and virtual reality technology, and the computer network, machine tool enterprise enhances the ability of decision-making and control at all levels of manufacturing process. This paper analyzes the key technologies to the virtual machine manufacturing and puts forward three models of the virtual machine manufacturing. © (2010) Trans Tech Publications. Source

Wang X.-J.,Guangdong Technology Normal College | Yin X.,Jinggangshan University
Key Engineering Materials

The measuring circuit of signal conditioning module of platinum resistance temperature sensor detection system uses a sub-three-wire connection mode. It can improve the measurement accuracy and reduce the measurement error caused by the external circuit. The amplifier circuit is an operation circuit using in phase input. The system can achieve multi-channel measurement of sensor by using multiplexer with the measurement accuracy of 0.1°C. © (2010) Trans Tech Publications. Source

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