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Synthesis and luminescent properties investigation of novel red emission phosphors Ca7Zn2(PO4)6: Re3+ (Re?=Eu, Sm and Pr)
摘要： A series of new red emission phosphors Ca7Zn2(PO4)6: Re3+ (Re3+ = Eu3+, Sm3+ and Pr3+) are synthesized by solid state reaction. The crystal structure and microstructure are systematically investigated by X-ray diffraction Rietveld structure refinement, scanning electron microscopy and energy dispersive spectrometer. The photoluminescence properties of Ca7Zn2(PO4)6: Re3+ (Re3+ = Eu3+, Sm3+ and Pr3+) are studied in detail. The results show that Eu3+ single doped Ca7Zn2(PO4)6 could emit red emissions with dominate peaks at 612 nm, 602 nm and 612 nm, respectively, which are attributed to the characteristic transitions (5D0-7F2, 4G5/2-6H7/2 and 3P0-3H6) of Eu3+, Sm3+ and Pr3+. The concentration dependent emission spectra of Ca7Zn2(PO4)6: Sm3+ are studied as well. A charge compensator Li2CO3 is added in Sm3+ doped Ca7Zn2(PO4)6 and the emission intensity is compared with the commercial red phosphor Y2O3:Eu3+. The room temperature fluorescence lifetimes of Ca7Zn2(PO4)6: Re3+ (Re3+ = Eu3+, Sm3+ and Pr3+) are measured and the average lifetimes are evaluated. Finally, the Commission Internationale de L'Eclairage chromaticity coordinates and their color purity are calculated.
关键词： Phosphor,Optical property,Luminescent property
更新于2025-09-23 15:22:29
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The luminescent properties of GdAlO<SUB align="right">3:Tb<SUP align="right">3+</SUP> phosphors based on molten salts addition
摘要： The (Gd1–xTbx)AlO3 (x = 0–0.12) were obtained through ammonium bicarbonate co-precipitation technology. The pure-phase (Gd1–xTbx)AlO3 with good dispersion could be obtained at relatively lower temperature of 1,000°C. Under optimum UV excitation into 275 nm, the photoluminescence (PL) spectra display a series of 5D4–7FJ transitions of Tb3+ in (Gd1–xTbx)AlO3 system with the strongest green emission at ~546 nm. The overlapping between 8S7/2–6IJ intra f-f transition of Gd3+ and 4f8–4f75d1 transition of Tb3+ at 275 nm suggesting the Gd3+ → Tb3+ energy transfer, and the quenching contents of Tb3+ was found to be ~10 at%. The luminescent property of GdAlO3:Tb3+ phosphor could be further improved with molten salt incorporation. The optimal composition of molten salts was determined to be the mixture of NaCl/Na2SO4 (5 wt% NaCl), and the mass ratio of mixture molten salts to precursor was 2:1. The relationship between the luminescent property and molten salts composition were studied in detail.
关键词： energy transfer,GdAlO3:Tb3+ phosphor,molten salts,luminescent property
更新于2025-09-23 15:22:29
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Characterization and Photoluminescence Property of a New Eu <sup>3+</sup> -doped Phosphor of the K <sub/>2</sub> [Al(B <sub/>5</sub> O <sub/>10</sub> )] Prepared by Precursor Method
摘要： A new phosphor of the K2[Al(B5O10)]:Eu3+ was prepared by annealing of the as-prepared of the precursor of K2[Al(B5O10)]·4H2O:Eu3+ at 300–400 °C, and which has been synthesized under facile hydrothermal conditions. All the samples were characterized by the EDS, XRD, FT-IR, and SEM. A systematic study on their luminescent properties has been performed by the PL and PLE. A series of influencing factors on the luminescent properties were also investigated. The PL and PLE studies reveal that the phosphor of K2[Al(B5O10)]:Eu3+ with optimal luminescent intensity and higher red-orange ratio were obtained by sintering the precursor at 400 °C for 5.5 h, with 9% doping concentration, which suggests that it might as a potential application of the light display systems.
关键词： Precursor method,Luminescent property,Eu3+ doped phosphor,Aluminoborate
更新于2025-09-23 15:22:29
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Synthesis, Crystal Structure and Luminescene of Zinc(II) Complex with 2,6-Pyridinedicarboxylic Acid Radical and 1,10-Phenanthroline
摘要： A new zinc(II) complex, [Zn(pydc)2]·[Zn(phen)2(H2O)2]·7.5H2O, has been synthesized by the reaction of zinc sulfate, 2,6-pyridinedicarboxylic acid (pydcH2) and 1,10-phenanthroline (phen) and characterized by elemental analysis, IR, UV-visible, TG and X-ray single-crystal diffraction. It crystallizes in triclinic, space group P 1 , with a = 1.0091 (3), b = 1.4799 (4), c = 1.4984 (4) nm, α = 73.783 (4), β = 78.374 (4), γ = 74.886 (4)°, V = 2.0543 (9) nm3, C28H41N6O17.5Zn2, Mr = 992.36, Z = 2, Dc = 1.574 Mg/m3, γ(MoKα) = 0.071073 nm, μ = 1.252 mm-1, F (000) = 984, S = 1.040, the final R = 0.0412 and wR = 0.1335 for 6128 observed reflections (I > 2σ (I)). The structure unit of the complex consists of two zinc ions with different coordination modes. Each 6-coordinated geometry of the Zn atom is a distorted octahedral coordination geometry. The complex shows a strong fluorescence emission at around 367 nm in methanol solution (CCDC: 848466).
关键词： Zinc complex,Luminescent property,Crystal structure
更新于2025-09-11 14:15:04
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Structural and Luminescent property of Holmium doped Borate Glasses
摘要： Holmium doped Lithium Lead Borate glasses of different compositions were prepared by melt quenching technique. Fourier transform infrared investigations on lithium lead borate glasses have been made to study the local order and vibrations of atoms in the glass network and it contains mainly BO3 and BO4 structural units. Photoluminescence techniques were employed to investigate the luminescent property of these glasses excited at 451nm. Blue emission have been observed from the transition 495 ( 5F3 —? 5I8 ).
关键词： Photoluminescence,Luminescent property,FTIR,Holmium doped Borate Glasses
更新于2025-09-10 09:29:36
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The synthesis and luminescent properties of Dy/Re (Re?=?Tb or Eu) co-doped Gd2(WO4)3 phosphor with tunable color via energy transfer
摘要： The new systems of the (Gd0.95-xDy0.05Tbx)2(WO4)3 (x = 0–0.1) and (Gd0.95-yDy0.05Euy)2(WO4)3 (y = 0–0.2) phosphors have been successfully obtained using the hydrothermal method at 900 °C in this work. The crystal structure, morphology, PL/PLE spectra, ?uorescence and decay analysis have been studied in detail via the combined techniques of XRD, FE-SEM, PLE/PL spectra and decay kinetic. The phase-pure of the (Gd0.95-xDy0.05Tbx)2(WO4)3 and (Gd0.95-yDy0.05Euy)2(WO4)3 with good dispersions have been formed at the lower sintering temperature of 900 °C. Under 273 nm and 270 nm excitation (the 6P7/2→8S7/2 transitions of Gd3+), the Gd2(WO4)3:Dy3+/Tb3+ and Gd2(WO4)3:Dy3+/Eu3+ phosphors exhibit both Dy3+ (yellow, at 574 nm) and Tb3+ (green, at 547 nm) as well as Dy3+ (yellow, at 574 nm) and Eu3+ (red, at 616 nm) emissions, respectively. The presences of WO4 2-, Gd3+ and Dy3+ excitation bands on the PLE spectra by monitoring the Tb3+ and Eu3+ emissions directly provide an evidence of energy transfer of WO4 2-→Tb3+, Gd3+→Tb3+ and Dy3+→Tb3+, as well as WO4 2-→Eu3+, Gd3+→Eu3+ and Dy3+→Eu3+, respectively. The quenching concentrations of both two systems are determined to be 7 at% (x = 0.07 for Tb3+) and 10 at% (y = 0.10 for Eu3+), and the quenching mechanisms of both two systems are mainly due to the Tb3+-Tb3+ and Eu3+-Eu3+ energy transfers, respectively. The color-tunable emission can be achieved though adjusting the relative content ratios of Dy3+/Tb3+ or Dy3+/Eu3+, which has been veri?ed by the CIE chromaticity coordinates analysis. The energy transfer e?ciencies of Dy3+→Tb3+ and Dy3+→Eu3+ have been calculated, and the energy transfer mechanisms have been analyzed in detail. The (Gd0.95-xDy0.05Tbx)2(WO4)3 and (Gd0.95-yDy0.05Euy)2(WO4)3 phosphors with color-tunable emission may have a potential application for w-LEDs.
关键词： Color-tunable emission,Gd2(WO4)3:Dy3+/Tb3+,Gd2(WO4)3:Dy3+/Eu3+,Luminescent property
更新于2025-09-10 09:29:36