Sr2Al2SiO7:Ce^3+, Tb^3+ white emitting phosphors were fabricated using the sol-gel method. X-Ray Powder Diffraction (XRD) analysis confirmed the formation of Sr2Al2SiO7:Ce^3+, Tb^3+. Scanning Electron Microsco...Sr2Al2SiO7:Ce^3+, Tb^3+ white emitting phosphors were fabricated using the sol-gel method. X-Ray Powder Diffraction (XRD) analysis confirmed the formation of Sr2Al2SiO7:Ce^3+, Tb^3+. Scanning Electron Microscopy (SEM) observation indicated that the microstructure of the phosphor consisted of regular fine grains with an average size of about 0.5-1 μm. Luminescence properties were analyzed by measuring the photoluminescence spectra. The Ce^3+, Tb^3+-codoped Sr2Al2SiO7 phosphors showed four main emission peaks: one at 414 nm for Ce^3+ and three at 482, 543, and 588 nm for Tb^3+. The emission spectra of the samples with different doping concentrations showed that the Tb^3+ emission was dominant because of the persistent energy transfer from Ce^3+. The decay characteristic was better than that prepared by the solid-state process in the comparable condition. The codoped phosphor displayed long persistent white phosphorescence.展开更多
YAl3 (BO3)4: Eu^3+ phosphors were prepared by the conventional solid state reaction. The phase structure and morphology were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). Dopi...YAl3 (BO3)4: Eu^3+ phosphors were prepared by the conventional solid state reaction. The phase structure and morphology were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). Doping YAl3(BO3)4: Eu^3+ phosphors with concentration of Eu^3+ ions of 0, 2, 5, 8 and 10 mol% were studied and their luminescent properties at room temperature were discussed. The excitation spectrum of Y0.95Eu0.05Al3(BO3)4 was composed of a broad band centered at about 252 nm and a group of lines in the longer wavelength region. In the emission spectra, the peak wavelength was about 614 nm under a 252 nm UV excitation. The optimal doping concentration of Eu^3+ ions in YAl3(BO3)4: Eu^3+ phosphors was 8 mol%.展开更多
基金the National Natural Science Foundation of China (20376009)the Liaoning Natural Science Foundation (20032129) of China
文摘Sr2Al2SiO7:Ce^3+, Tb^3+ white emitting phosphors were fabricated using the sol-gel method. X-Ray Powder Diffraction (XRD) analysis confirmed the formation of Sr2Al2SiO7:Ce^3+, Tb^3+. Scanning Electron Microscopy (SEM) observation indicated that the microstructure of the phosphor consisted of regular fine grains with an average size of about 0.5-1 μm. Luminescence properties were analyzed by measuring the photoluminescence spectra. The Ce^3+, Tb^3+-codoped Sr2Al2SiO7 phosphors showed four main emission peaks: one at 414 nm for Ce^3+ and three at 482, 543, and 588 nm for Tb^3+. The emission spectra of the samples with different doping concentrations showed that the Tb^3+ emission was dominant because of the persistent energy transfer from Ce^3+. The decay characteristic was better than that prepared by the solid-state process in the comparable condition. The codoped phosphor displayed long persistent white phosphorescence.
文摘YAl3 (BO3)4: Eu^3+ phosphors were prepared by the conventional solid state reaction. The phase structure and morphology were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). Doping YAl3(BO3)4: Eu^3+ phosphors with concentration of Eu^3+ ions of 0, 2, 5, 8 and 10 mol% were studied and their luminescent properties at room temperature were discussed. The excitation spectrum of Y0.95Eu0.05Al3(BO3)4 was composed of a broad band centered at about 252 nm and a group of lines in the longer wavelength region. In the emission spectra, the peak wavelength was about 614 nm under a 252 nm UV excitation. The optimal doping concentration of Eu^3+ ions in YAl3(BO3)4: Eu^3+ phosphors was 8 mol%.