摘要
A needle-like Eu2＋ and Dy3＋ co-doped BaAI204 long-lasting phosphor was synthesized via a hydrothermal-homogeneous pre- cipitation method assisted by cetyl trimethyl ammonium bromide （CTAB） as a template. The crystal structure, morphology and opti- cal properties of the composites were characterized. XRD results showed that the single-phase BaA1204 was formed at 900 ℃ in an active carbon atmosphere, which was much lower than that prepared by traditional solid-state reaction method. Scanning electron mi- croscopy （SEM） and transmission electron microscopy （TEM） observation revealed that the precursor had well-dispersed distribution and showed needle-like morphology with the average diameter of about 100 nm and the length up to 1 μm. The final product, BaAI2Oa：Eu〉,Dy3＋ phosphor, inherited the needle-like shape from precursor via adding the surfactant CTAB. After irradiation by ul- traviolet radiation with 355 nm for 5 rain, the phosphors emitted bluish green color long-lasting phosphorescence corresponding to the typical emission of Eu2＋ ion. Both the photoluminescence spectra and luminance decay revealed that the phosphor had efficient lumi- nescent and long-lasting properties.
A needle-like Eu2＋ and Dy3＋ co-doped BaAI204 long-lasting phosphor was synthesized via a hydrothermal-homogeneous pre- cipitation method assisted by cetyl trimethyl ammonium bromide （CTAB） as a template. The crystal structure, morphology and opti- cal properties of the composites were characterized. XRD results showed that the single-phase BaA1204 was formed at 900 ℃ in an active carbon atmosphere, which was much lower than that prepared by traditional solid-state reaction method. Scanning electron mi- croscopy （SEM） and transmission electron microscopy （TEM） observation revealed that the precursor had well-dispersed distribution and showed needle-like morphology with the average diameter of about 100 nm and the length up to 1 μm. The final product, BaAI2Oa：Eu〉,Dy3＋ phosphor, inherited the needle-like shape from precursor via adding the surfactant CTAB. After irradiation by ul- traviolet radiation with 355 nm for 5 rain, the phosphors emitted bluish green color long-lasting phosphorescence corresponding to the typical emission of Eu2＋ ion. Both the photoluminescence spectra and luminance decay revealed that the phosphor had efficient lumi- nescent and long-lasting properties.
基金
supported by National Natural Science Foundations of China (50872045,21071063)
