Abstract
phosphors were prepared by a Pechini sol-gel process. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), photoluminescence (PL), cathodoluminescence (CL) spectra, as well as lifetimes were utilized to characterize the synthesized phosphors. XRD and HRTEM results reveal that the samples are obtained with high crystallinity. The FESEM images indicate that phosphors are composed of fine and spherical grains around in size. Under the excitation of UV light, laser, and low-voltage electron beams, all phosphors show the characteristic emission of the ion (, transition) with green luminescence, which is easily observed by our naked eyes. The corresponding luminescent mechanisms have been discussed. Due to the excellent PL (including upconversion and downconversion) properties, CL properties, and cheap materials of the phosphors, the as-prepared phosphors are potentially applied for fluorescent lamps, upconversion fluorescent labels, and field emission display devices.
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