新型红色荧光粉NaLa_(0.7)(MoO_4)_(2-x)(WO_4)_x∶0.3Eu~(3+)的制备及发光性质研究

采用高温固相法合成具有余辉性能的发光材料NaLa_(0.7)(MoO_4)_(2-x)(WO_4)_x∶0.3Eu~(3+)(x=0,0.5,1,1.5,2)。用X射线衍射(XRD)和荧光光谱对样品的晶体结构和发光特性进行表征。测试结果表明,在900℃下烧结8 h所合成的NaLa_(0.7)(MoO_4)_(2-x)(WO_4)_x∶0.3Eu~(3+)样品为纯相Na La(Mo O_4)_2,样品可被近紫外光393nm和蓝光462 nm有效激发,其发射主峰位于615 nm处,属于Eu3+的5D0-7F2跃迁。Na La_(0.7)(Mo O_4)_(2-x)-(WO_4)_x∶0.3Eu~(3+)的发光强度随着W6+浓度的增加而增大,当W6+掺杂量x=1时发光最强,而后随W6+掺杂浓度的增加出现浓度猝灭现象。通过计算得到样品在393 nm和462 nm激发下的色坐标,当W6+的掺杂量x=1时,样品的红光色纯度最好。

Synthesis and Photoluminescence Properties of NaLa0.7(MoO4)2-x(WO4)x:0. 3Eu3+ Novel Red Phosphors

NaLa0.7(MoO4)2-x(WO4)x∶0. 3Eu3+ afterglow luminescent materials were synthesized by solid state reaction. The crystal structure and luminescence properties of the samples were char-acterized by means of X-ray diffraction and photoluminescence spectra. The results show that NaLa0.7(MoO4)2-x(WO4)x∶0. 3Eu3+ phosphors can be excited efficiently by near-ultraviolet (393 nm) and blue light (462 nm), and the main emission peak is located at 615 nm due to 5D0-7F2 transition of Eu3+ ions. X-ray diffraction pantterns ( XRD ) show that the phosphors calcinated at 900 ℃ for 8 h were pure NaLa( MoO4 ) 2 crystal phase. The luminescent intensity of NaLa0.7(MoO4)2-x(WO4)x∶0. 3Eu3+ increases with the increasing of W6+ content, and reaches the maximum when the doping content of W6+(x) is 1. The phenomenon of concentration quenching oc-curs when W6+ doping concentration is excess. Moreover, the CIE chromaticity ( x, y) of NaLa0. 7-(MoO4)2-x(WO4)x∶0. 3Eu3+ excited by 393 nm and 462 nm lights were analyzed. When the doping concentration of W6+(x) is 1, the red chromaticity coordinate of the samples is closer to the Commission International de L’Eclairage ( CIE) chromaticity coordinates.