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Sol-gel synthesis and the luminescent properties of CaNb_2O_6 phosphor powders

机译:CaNb_2O_6荧光粉的溶胶-凝胶合成及发光性能

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摘要

Synthesis and luminescence properties of CaNb_2O_6 oxides by the sol-gel process were investigated. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), photoluminescence spectroscopy and absorption spectra.The PLspectra excited at 257 nm have a broad and strong blue emission band maximum at 457 nm, corresponding to the self-activated luminescence of the niobate octahedra group [NbO_6]~(7-). The optical absorption spectra of the 700°C sample exhibited the band-gap energies of 3.53 eV.
机译:研究了溶胶-凝胶法合成CaNb_2O_6氧化物及其发光性能。产品通过X射线衍射(XRD),扫描电子显微镜(SEM),高分辨率透射电子显微镜(HRTEM),光致发光光谱和吸收光谱进行表征。在257 nm激发的PL光谱具有宽而强的蓝色发射带。最大波长为457 nm,对应于铌酸盐八面体[NbO_6]〜(7-)的自激活发光。 700°C样品的光吸收光谱显示出3.53 eV的带隙能。

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