Papers by Keyword: Ce3+

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Authors: Natthakridta Chanthima, Thanapong Sareein, Yaowaluk Tariwong, Jakrapong Kaewkhao, Narong Sangwaranatee
Abstract: Bismuth borophosphate glasses containing different doping cerium oxide have been synthesized at 1200 °C by melt-quenching technique. The doping concentration of the Ce3+ was varied from 0.05 mol% to 2.0 mol%. The glass samples were characterized through optical absorption and luminescence spectral measurements. UV-visible and near infrared absorption spectra of glass samples were not observed nevertheless the absorption edge was shift to the longer wavelength. The photoluminescence and radioluminescence spectra show emission bands around 367 nm under 317 nm excitation wavelength. Also, the highest emission intensity was found at 0.5 mol% CeF3 dopant for both of photoluminescence and radioluminescence.
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Authors: Prapon Lertloypanyachai, Nakarin Pattanaboonmee, Weerapong Chewpraditkul, Dan Ping Chen, Vladimir Babin, Martin Nikl
Abstract: This report presents the luminescence and scintillation response of Ce3+-doped oxide glasses with high Gd2O3 (30 mol%) content. The characteristic emission of Ce3+ 5d → 4f transition peaking around 380 nm was observed in its luminescence spectra under UV and X-ray excitation. Photoluminescence decay kinetics was governed by a few tens of nanoseconds decay time. The integral scintillation efficiency of about 22% of that of the Bi4Ge3O12 scintillator was obtained under X-ray irradiation. The light yield and its dependence on the integration time were measured and compared with that of the Bi4Ge3O12 crystal. The total mass attenuation coefficient at 662 keV γ-rays was also determined and compared with the theoretical one calculated using the WinXCom program.
434
Authors: Cheng Gang Zuo, An Xian Lu, Li Gang Zhu, Wo Yun Long
Abstract: Ce3+ or Tb3+ ions activated lithium-barium-gadolinium-aluminosilicate oxyfluoride glasses have been prepared. The transmission, emission and excitation spectra were measured. It has been found that those Ce3+ or Tb3+-doped lithium-barium-gadolinium-aluminosilicate oxyfluoride glasses exhibit good UV-excited luminescence. Energy transfer process from Gd3+ ion to Ce3+ or Tb3+ ion is indicated.
468
Authors: S. Kapphan, G. Greten, R. Pankrath
321
Authors: Si Qing Shen, Zhi Bin Xu, Qing Ma, Jian Jun Xie, Ying Shi, Jia Yue Xu, Fei Ai
Abstract: Ln3+ (Ce3+ and Tb3+) -doped Lu2SiO5 thin films were fabricated by Pechini sol–gel method combined with spin-coating technique on silicon substrates. The results of XRD patterns indicate that the films are completely crystallized at 1100 °C, the AFM observation reveals that the phosphor films are uniform and crack-free, consisting of closely packed grains with an average size of 200-300 nm. The PL and PLE spectra show the characteristic emission for Tb3+ and Ce3+, the optimum concentrations are found for LSO:Tb3+ (8%) and LSO:Ce3+ (2%) with respectively, the effect of heat-treatment temperature on the luminescent properties is also investigated.
631
Authors: Prapon Lertloypanyachai, Nakarin Pattanaboonmee, Weerapong Chewpraditkul, Dan Ping Chen, Martin Nikl
Abstract: Photo-and radioluminescence characteristics of Ce3+-doped dense oxide glass (SiO2-B2O3-Al2O3-Gd2O3) are presented. The Gd3+→ Ce3+ energy transfer was evidenced by photoluminescence excitation spectra of Ce3+ emission. Photoluminescence decay kinetics was governed by a few tens of nanoseconds decay time. The integral scintillation efficiency of about 22% of that of the Bi4Ge3O12 scintillator was obtained under X-ray irradiation. Scintillation light yield under alpha particle excitation was measured and compared with that of the Bi4Ge3O12 crystal.
350
Authors: Hui Hong Lin, Yun Ying Wu, Hai Yang Chen
Abstract: The phosphors Sr3B2O6: Ce3+, Sr3B2O6: Tb3+ and Sr3B2O6: Ce3+, Tb3+ were synthesized by the solid-state reaction method at high temperature. For the phosphor Sr3B2O6: Ce3+, the lowest 5d levels, the emission and the Stokes shifts of Ce3+ in the host lattice were identified. In addition, its concentration quenching process was also studied. For the phosphor Sr3B2O6: Tb3+, the f-d transitions of Tb3+ in the host lattice were assigned and discussed. Moreover, the energy transfer phenomenon between Ce3+ and Tb3+ in Sr3B2O6: Ce3+, Tb3+ was discussed. The emission of Tb3+ is significantly enhanced due to energy transfer from Ce3+ to Tb3+ when Ce3+, Tb3+ dopants were used together in Sr3B2O6.
1169
Authors: Hui Hong Lin, Yan Ru Lin, Gui Po Fang
Abstract: The phosphors Ca3(BO3)2: Ce3+, Ca3(BO3)2: Tb3+ and Ca3(BO3)2: Ce3+, Tb3+ were synthesized by the solid-state reaction method at high temperature. The phase purity was characterized by the powder x-ray diffraction (XRD). The luminescence properties were investigated by ultraviolet (UV)-Vis spectra. For the phosphor Ca3(BO3)2: Ce3+, the lowest 5d levels, the emission and the Stokes shifts of Ce3+ in the host lattice are identified. For the phosphor Ca3(BO3)2: Tb3+, the f-d transitions of Tb3+ in the host lattice are assigned and discussed. Moreover, the energy transfer phenomenon between Ce3+ and Tb3+ in Ca3(BO3)2: Ce3+, Tb3+ has been discussed. The emission of Tb3+ is remarkably enhanced due to energy transfer from Ce3+ to Tb3+ when Ce3+, Tb3+ doped together in Ca3(BO3)2.
647
Authors: Rafael Martínez-Martínez, Edgardo Yescas, Enrique Álvarez, Ciro Falcony, Ulises Caldiño
Abstract: Aluminium and hafnium oxide films doped with CeCl3/TbCl3/MnCl2 were deposited at 300 °C by ultrasonic spray pyrolysis. The films analysed by X-Ray diffraction exhibit a very broad band typical of amorphous materials. Non-radiative energy transfer from Ce3+ to Tb3+ and Mn2+ is observed upon UV excitation at 280 nm (peak emission wavelength of AlGaN-based LEDs). Such energy transfer gives place to a simultaneous emission of the donor and acceptor ions in the blue, green, yellow and red regions, resulting in cold white light emission, with chromaticity coordinates and colour temperatures: (0.30,0.32) and 7300 K (AOCTM film), and (0.32,0.37) and 6400 K (HOCTM film). Thus, this type of thin films might contribute to the development of efficient AlGaN-based LEDs pumped phosphors for cold white light generation.
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