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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。
The red phosphor Sr0.7Ca0.3-2 xMoO4Eux3 + Nax + was synthesized by high temperature solid-phase method. The samples were respectively analyzed by X-ray diffraction (XRD) and fluorescence spectroscopy. The fluorescence of synthesized under different doping amount Luminous properties of the powder. XRD pattern analysis showed that the sample obtained after burning at 1000 ℃ for 9h was pure phase of SrMoO4. The results show that Sr0.7Ca0.3-2 xMoO4: Eux3 + Nax + phosphors can be effectively excited by near-UV light (393nm) and blue light (464nm). In the emission spectrum, Sr0.7Ca0.3-2xMoO4: Eux3 + Of the emission peak, the strongest emission peak at 615nm or so, and Eu3 + 5D0 → 7F2 transition corresponding. The effect of Na + and Eu3 + doping concentration on the luminescence intensity of Sr0.7Ca0.3-2xMoO4: Eux3 + Nax + was further studied. The results showed that the emission intensity of Sr0.7Ca0.3-2xMoO4: Eux3 + Nax + sample was stronger than that of SrMoO4: Eu3 + Na + Sr0.7Ca0.3-2 x MoO4: Eux3 + Nax + samples showed the strongest emission at 614 nm. Finally, the color coordinates of the sample under UV excitation at 393nm were calculated. When the doping amount of Eu3 + and Na + was x = 0.02, the red color of the sample was the strongest. The results show that the synthesized red phosphor Sr0.7Ca0.3-2 xMoO4: Eux3 + Nax + new red phosphor is suitable for white LED applications.