Photoluminescence properties of (Y1−x−yMxEuy)BO3 (M=Al, Zn, and La) phosphors prepared by ultrasonic spray pyrolysis under VUV excitation

Determining the minimum required uranium carbide content for HTGR UCO fuel kernels

“…Input data were obtained from thermodynamics and reactor physics calculations capturing more nuclear and chemical factors compared to past analyses. For example, a CALPHAD model for the urania solution [17][18][19][20][21][22][23][24] with dissolved Pu and Ln's provides a better representation of the μ O 2 -O/M relationship. Further, included for the first time were the detailed effects of both burnup and residual concentrations of Pu and Np oxides.…”

“…4. This figure was generated using the FactSage thermodynamic database [8] and a model for fluorite-structure urania solution, (U,Pu,Ln)O 2-x , with dissolved Ln oxides [17][18][19][20][21][22][23][24]. Figure 4 shows that Ln's, excluding Eu, are oxidized first, followed by BaC as BaZrO 3 , UC x phase, SrC as SrZrO 3 , EuC 2 and finally ZrC as ZrO 2 .…”

Enhanced photoluminescence of GdPO4:Tb3+ under VUV excitation by controlling ZnO content and annealing temperature

“…Upon excitation by UV radiation, the LaPO 4 :Eu 3+ phosphors showed the characteristic 5 D 0 -7 F 1-3 emissions of Eu 3+ , while the LaPO 4 :Ce 3+ ,Tb 3+ showed the characteristic 5 D 4 -7 F 3-6 emissions of Tb 3+ . It is known that controlling the composition and/or process, especially annealing, is a feasible route for improving PL characteristics [12,13]. Therefore, in the present work, to improve PL characteristics, we fabricated the Zn 2+ -added GdPO 4 :Tb 3 phosphors annealed at various temperatures (800-1100 • C) and investigated their microstructure and PL properties, depending on the Zn 2+ contents and annealing temperature.…”

Electronic structures and Eu3+ photoluminescence behaviors in Y2Si2O7 and La2Si2O7

“…The success in developing vacuum violet (VUV) light sources from rare-gas plasma and excimer discharges has realized the applications of VUV phosphors in Hg-free lamps, plasma display panels (PDPs), liquid crystal display (LCD) backlights [1][2][3][4][5][6] and other optoelectronic fields [7,8]. However, current VUV phosphors do not have sufficient conversion efficiency due to high energy losses during the nonradiative relaxation process.…”