RESUMO
Ca2Gd8(SiO4)6O2:A (A = Eu³âº and Dy³âº) 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 emis- sions in CaâºGd8(SiO4)6O2 phophors, i.e., 5D0 --> 7F2 (615 nm) for Eu³âº and 4F9/22 --> 6H15/2 (483 nm) and 4F9/2 --> 6H13/2 (575 nm) for Dy³âº. The optimum concentration for doped rare earth ions was determined to be 9 mol% Eu³âº and 3 mol% Dy³âº of Gd³âº in Ca2Gd8(SiO4)6O2
Assuntos
Compostos de Cálcio/química , Európio/química , Gadolínio/química , Luminescência , Semicondutores , Silicatos/químicaRESUMO
This paper reports the synthesis and luminescence properties of rare earth doped CaYAI3O7 prepared via a sol-gel process. The phosphors have intense luminescence. In Ce³âº/Tb³âº co-doped materials, there is energy transfer from Ce³âº to Tb³âº that enhances the luminescence of Tb³âº. These materials may find applications in solid state lighting and radiation detection.
