摘要
Ca3R2–xWO9:xEu^3+(R=Y, Gd) red-emitting phosphors were prepared by solid state reactions. These samples were characterized by differential scanning calorimetry and thermogravimetry analysis(DSC-TGA), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), photoluminescence(PL) and field emission scanning electron microscopy(FE-SEM) analyses. The optimum sintering temperature for these phosphors was 1100 ℃, and the optimum sintering time was 2 h. The optimum doped concentration of Eu^3+ in Ca3Y2–xWO9:xEu^3+ and Ca3Gd2–xWO9:xEu^3+ were x=1.5 and x=1.1, respectively. These phosphors could be excited by near-UV light of 394 nm and blue light of 465 nm, and showed strong red emission line at 612 nm(^5D0→^7F2), which indicated that Ca3R2–xWO9:xEu^3+(R=Y, Gd) were promising red candidates for white LED.
Ca3R2–xWO9:xEu^3+(R=Y, Gd) red-emitting phosphors were prepared by solid state reactions. These samples were characterized by differential scanning calorimetry and thermogravimetry analysis(DSC-TGA), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), photoluminescence(PL) and field emission scanning electron microscopy(FE-SEM) analyses. The optimum sintering temperature for these phosphors was 1100 ℃, and the optimum sintering time was 2 h. The optimum doped concentration of Eu^3+ in Ca3Y2–xWO9:xEu^3+ and Ca3Gd2–xWO9:xEu^3+ were x=1.5 and x=1.1, respectively. These phosphors could be excited by near-UV light of 394 nm and blue light of 465 nm, and showed strong red emission line at 612 nm(^5D0→^7F2), which indicated that Ca3R2–xWO9:xEu^3+(R=Y, Gd) were promising red candidates for white LED.
基金
Project supported by the Fujian Provincial Department of Education Project(JA13331)