摘要
通过掺杂具有价态补偿且离子半径较小的Li^(+)与Al^(3+)来改善SrWO_(4)∶Dy^(3+),Eu^(3+)荧光粉发光性能,制备出一种色温低且发光强度好的白光LED用荧光粉,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、分光光度计对样品的物相结构、形貌及发光性能进行了表征及分析。结果表明,掺杂金属离子后的样品主晶相仍均为SrWO_(4),微观结构主要为梭形结构,在391 nm波长激发下,掺杂7.5%Al^(3+)荧光粉样品与未掺杂金属离子SrWO_(4)∶2.5%Dy^(3+),7.5%Eu^(3+)荧光粉相比发光强度及发光颜色有了很大改善,色坐标为(0.338,0.342),色温为4337 K,在619 nm处发光强度与不掺杂金属离子样品相比提高了8倍,其次为SrWO_(4)∶2.5%Dy^(3+),7.5%Eu^(3+),7.5%Li^(+)样品,样品色坐标为(0.380,0.401),色温为4867 K,在619 nm处发光强度与不掺杂金属离子样品相比提高了5倍,通过添加Li^(+)、Al^(3+)可以提高发光离子之间的能量传递作用,从而增加荧光粉发光颜色中红色成分,最终实现色坐标的红移,色温的降低。在低色温照明领域的研究中具有一定的研究意义。
To improve the luminous performance of SrWO_(4)∶Dy^(3+),Eu^(3+)phosphors,the Li^(+)and Al^(3+)with valence state compensation and smaller radius were used as dopant.The white LED phosphor with low color temperature and good luminous intensity was prepared in this study.The phase structure,morphology and luminescence properties of the samples were characterized by the X-ray Diffraction(XRD),Scanning Electron Microscope(SEM),and Spectrophotometer.The results showed that the main phase of the sample doped with metal ions was SrWO_(4),and the microstructure was mainly a spindle structure.The luminous intensity and luminous color have been greatly improved for the sample doped with 7.5%Al^(3+),compared with non-doped phosphors.The color coordinate was(0.338,0.342),the color temperature was 4337 K,and the luminescence intensity at 619 nm was 8 times higher than that of samples without metal ions.For the sample(SrWO_(4)∶2.5%Dy^(3+),7.5%Eu^(3+),7.5%Li^(+)),the color coordinate was(0.380,0.401),the color temperature was 4867 K,and the luminescence intensity at 619 nm was 5 times higher than that of samples without metal ions.The energy transfer effect between luminescent ions can be improved by adding Li^(+)and Al^(3+),then the red component of the phosphor was increased,resulting in the red shift of the color coordinate and decreased color temperature.This study is meaningful in the field of low color temperature lighting.
作者
胡斌
孔维静
周恒为
何晓燕
HU Bin;KONG Weijing;ZHOU Hengwei;HE Xiaoyan(School of Physics and Electrical Engineering,Kashgar University,Kashgar 844006,China;Laboratory of Condensed Matter Phase Transition and Microstructure,Yili Normal University,Yining 835000,China;School of Chemistry and Environmental Science,Yili Normal University,Yining 835000,China)
出处
《有色金属工程》
CAS
北大核心
2021年第5期18-24,共7页
Nonferrous Metals Engineering
基金
新疆维吾尔自治区研究生科研创新项目(XJ2019G294)。
