کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1259214 | 971667 | 2015 | 5 صفحه PDF | دانلود رایگان |
Ca3R2–xWO9:xEu3+ (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 °C, and the optimum sintering time was 2 h. The optimum doped concentration of Eu3+ in Ca3Y2–xWO9:xEu3+ and Ca3Gd2–xWO9:xEu3+ 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:xEu3+ (R=Y, Gd) were promising red candidates for white LED.
Graphical AbstractExcitation and emission spectra of CaY0.5W:1.5Eu3+ (a) and CaGd0.9W:1.1Eu3+ (b)Figure optionsDownload as PowerPoint slide
Journal: Journal of Rare Earths - Volume 33, Issue 2, February 2015, Pages 135–139