A promising red-emitting phosphor for white-light-emitting diodes prepared by a modified solid-state reaction

摘要

Using urea, boric acid and polyethylene glycol (PEG) as auxiliary reagents, the novel red-emittingphosphors Ca_(19)Zn_2(PO_4)14:Eu~(3+0have been successfully synthesized by a modified solid-state reaction.Thermogravimetric (TG) analysis, X-ray diffraction (XRD), transmission electron microscopy (TEM) andphotoluminescence (PL) spectra were used to characterize the resulting phosphors. The dependence ofthe photoluminescence properties of Ca_(19)Zn_2(PO_4)14:Eu~(3+)phosphors upon urea, boric acid and PEGconcentration and the quadric-sintered temperature were investigated. Luminescent measurementsshowed that the phosphors can be efficiently excited by ultraviolet (UV) to visible region, emitting a redlight with a peak wavelength of 616 nm. The material has potential application as a fluorescent materialfor ultraviolet light-emitting diodes (UV-LEDs).