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Xia W.,Changchun University of Science and Technology | Xia W.,Dalian Luminglight Science and Technology Co. | Zhang X.,Changchun University of Science and Technology | Lu L.,Changchun University of Science and Technology | Liu Q.,Changchun University of Science and Technology
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2016

Eu-doped calcium magnesium chlorosilicate phosphors (i.e., Ca8-xMg(SiO4)4Cl2:xEu2+) were prepared by a high-temperature solid state reaction method in a reducing atmosphere. The crystal structure and luminescent properties of the samples were characterized by X-ray diffraction, photoluminescence spectroscopy and scanning electron microscopy, respectively. Effects of Eu3+-doped amount and flux type on the luminescence performance of the samples were investigated. The results show that the Ca8-xMg(SiO4)4Cl2:xEu2+ synthesized belongs to a face-centered cubic structure with space group of Fd3. The excitation and emission spectra of the samples are a broadband spectrum. The excitation peak strength in the range of 451-463 nm is most intense. The phosphor samples emit a blue-green light under the wavelength of 458 nm excitation, and the emission peak appears in the range of 508-511 nm. The maximum luminous intensity is obtained at Eu3+-doped amount of 0.13 in mol. The luminous intensity of phosphors is significantly increased after CaF2, BaF2 or BaCl2 of 0.2% mole fraction added as a flux, respectively. The luminescence intensity of the sample with BaCl2 is increased by 12%. The application performance of the materials in white LED is also analyzed. The blue-green phosphors can improve the color rendering properties of the white LED, and the color rendering index can reach >95. © 2016, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved. Source


Xia W.,Changchun University of Science and Technology | Xia W.,Dalian Luminglight Science and Technology Co. | Zhang X.-Y.,Changchun University of Science and Technology | Wang X.-F.,Dalian Luminglight Science and Technology Co. | Xiao Z.-G.,Dalian Luminglight Science and Technology Co.
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2013

The apatite phosphors of Sr5-x(PO4)2SiO4: xEu2+ were prepared by a high temperature solid-state reaction method in a reducing atmosphere. The crystal structure, excitation and emission spectra and morphology of the samples were characterized by XRD, PL and SEM methods, respectively. The effect of Eu2+ doping concentration on the luminescence properties of Sr5-x(PO4)2SiO4: xEu2+ was also investigated. Two different luminescence centers were formed because Eu2+occupied two different crystallographic site in the crystal structure. Two emission bands located in blue and yellow light region were observed in a low concentration of Eu2+. Along with the increase of Eu2+ doping concentration, the PL intensity of emission peak in yellow light region gradually increased because of the energy transfer between Eu2+ ions, and reached the maximum value when x=0.075. Red shift of the emission peak may be due to the joint action of crystal field strength and the mechanism of energy transfer. The application of these phosphors to the white LED was also explored. It is found that the phosphors with double emission peaks are beneficial to the improvement of color rendering properties to the LED light sources. Source


Jingjie Y.,Dalian University of Technology | Jingjie Y.,Dalian Luminglight Science and Technology Co. | Gong W.,Dalian University of Technology | Zhang Y.,Dalian Luminglight Science and Technology Co. | Ning G.,Dalian University of Technology
Journal of Luminescence | Year: 2014

New phosphors based on apatite-silicate single matrix doped with Eu ions were prepared by solid state reaction. One phosphor, Ba9.25(PO 4)4(SiO4)2:0.75 Eu2+, showed two emission peaks located at 415 nm and 507 nm. In contrast, another phosphor, (Ba6.94Sr2.31)(PO4) 4(SiO4)2:0.75 Eu2+, owing to the presence of excess SrF2, exhibited three clear emission peaks at 415 nm, 507 nm, and 565 nm, respectively. This is beneficial for potential use as white-light-emitting diodes. © 2013 Elsevier B.V. Source


Yu J.,Dalian University of Technology | Yu J.,Dalian Luminglight Science and Technology Co. | Gong W.,Dalian University of Technology | Xiao Z.,Dalian Luminglight Science and Technology Co. | Ning G.,Dalian University of Technology
Journal of Luminescence | Year: 2012

The new apatite-silicate phosphor doped with Eu ions in Ba 10(PO 4) 4(SiO 4) 2 matrix was synthesized through solid-state reaction. It was found that the as-synthesized phosphor displayed apparent mixture of band and line emission peaks giving rise to pseudo white light. The narrow emission bands peaking at 410 nm can be assigned to the 4f 65d→4f 7( 8S 7/2) transition of Eu 2 ions, and the other band at 507 nm is ascribed to anomalous fluorescent emission. One group of line emission peaking at 595 nm and 613 m were due to the 5D 0→ 7F 1 and 5D 0→ 7F 2 transition of Eu 3 ions. The occurrence of photostimulated luminescence and discrete emission lines in violet (410 nm), green (507 nm) and red (595 nm and 613 nm) colors indicate that this material has potential application in fields of white-light-emitting. © 2012 Elsevier B.V. All rights reserved. Source

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