The Photoluminescence Properties of Dendritic Phosphors Ca2Gd8(SiO4)6O2:A (A = Eu3+ and Dy3+) for White-Light-Emitting Diodes
Ca2Gd8(SiO4)6O2:A (A = Eu3+ and Dy3+) phosphors were successfully synthesized by the sol– gel process. X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and photoluminescence spectra were used to characterize the resulting phosphors. The results of XRD indicated that the diffraction peaks of the phosphor powder agreed well with the standard card. Under short ultraviolet excitation, the doped rare earth ions (A) showed their characteristic emissions in Ca2Gd8(SiO4)6O2 phophors, i.e., 5D0 → 7F2 (615 nm) for Eu3+ and 4F9/2→6H15/2 (483 nm) and 4F9/2 →6H13/2 (575 nm) for Dy3+. The optimum concentration for doped rare earth ions was determined to be 9 mol% Eu3+ and 3 mol% Dy3+ of Gd3+ in Ca2Gd8(SiO4)6O2.
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Document Type: Research Article
Publication date: January 1, 2016
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