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白光LED用红色荧光粉Sr0.7Ca0.3-2 xMoO4Eux3＋Nax＋的制备及发光性能研究

ISSN号：1005-0086
期刊名称：《光电子．激光》
时间：0
分类：O484[理学—固体物理;理学—物理]
作者机构：[1]贵州大学电子信息学院电子科学系、贵州省电子功能复合材料特色重点实验室,贵州贵阳550025, [2]贵州师范大学物理与电子科学学院,贵州贵阳550001
相关基金：贵州省科学技术基金（黔科合J字[2013]2216号）、贵州省科技计划（2012-3005）和贵阳市科技计划（2012101-2-4）资助项目

关键词：钼酸盐, 红色荧光粉, 高温固相法, 白光LED, molybdate, red phosphor, solid state method, white LEDs

中文摘要：

采用高温固相法合成白光LED用红色荧光粉Sr0.7Ca0.3-2 xMoO4Eux3＋Nax＋,对样品分别进行X射线衍射（XRD）分析和荧光光谱的测定,讨论了不同掺杂量下合成的荧光粉的发光性质。XRD图谱分析表明,在1 000℃下灼烧9h得到的样品为纯相的SrMoO4。研究结果表明,制备的Sr0.7Ca0.3-2 xMoO4：Eux3＋Nax＋荧光粉可以被近紫外光（393nm）和蓝光（464nm）有效激发;发射光谱中,在波长在611nm和615nm处有很强的发射峰,其中最强发射峰位于615nm左右,与Eu3＋的5D0→7F2跃迁对应。进一步探讨Na＋和Eu3＋掺杂浓度对发光强度的影响,得出Sr0.7Ca0.3-2 x MoO4：Eux3＋Nax＋样品的发光强度比SrMoO4：Eu3＋Na＋增强,当掺杂量x=0.07时,Sr0.7Ca0.3-2 x MoO4：Eux3＋Nax＋样品在波长614nm处发光强度最强。最后测试计算样品在393nm紫外激发下的色坐标,当Eu3＋和Na＋的掺杂量x=0.02时,样品红色显示最强。研究结果表明,所合成的红色荧光粉Sr0.7Ca0.3-2 xMoO4：Eux3＋Nax＋新型红色荧光粉适合在白光LED中应用。

英文摘要：

Sr0.7Ca0.3-2 xMoO4Eux3＋Nax＋ red phosphor materials for white LEDs were synthesized by the high temperature solid state reaction. The samples were characterized by means of X-ray diffraction and photoluminescence （PZ） spectra, The luminescent properties of Sr0.7Ca0.3-2 xMoO4Eux3＋Nax＋ with various concentrations of Eua＋ are investigated in detail. The XRD pantterns show that the phos- phors heated at 1 000 ℃ for 9 h are pure SrMoO4 phase. The results indicate that Sr0.7Ca0.3-2 xMoO4Eux3＋Nax＋ phosphors can be excited by 393 nm and 463 nm light. The emission spectra exhibit the most intense emission at 611 nm and 615 nm, especially the later which is corresponding to the 5D0 →7F2 transition of the Eua＋. Compared with SrMoO4 ： Eua＋ Na＋, the emission intensity of Sr0.7Ca0.3-2 xMoO4Eux3＋Nax＋ is increased obviously. Considering the influence of Eua＋ and Na＋ concen- trations on the luminescent property,the highest emission intensity at 614 nm is exhibited when x is 0. 07. Moreover, the CIE chromaticity of Sr0.7Ca0.3-2 xMoO4Eux3＋Nax＋ excited by 393 nm light is analyzed. When the x for Eu3＋ and Na＋ is 0. 02,phosphors of the samples turn from pink to red. These results indicate that the Sr0.7Ca0.3-2 xMoO4Eux3＋Nax＋ could be an attractive candidate phosphor in white LED applications.

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