Dy3+,Eu3+双掺单基质Ca9Y(PO4)7白色荧光粉的合成与发光性能

摘要

以具有多种格位的Ca9Y(PO4)7作为基质,以Dy3+和Eu3+作为共激活剂,利用高温固相法合成了一种单基质白光荧光粉.X射线衍射证实样品属于三方晶系菱面体结构,Dy3+和Eu3+在Ca9Y(PO4)7晶体中占据了Y3+的格位.样品在365 nm紫外线激发下,荧光光谱同时出现了Dy3+和Eu3+的特征发射,且发光强度以及色度坐标随着Dy3+和Eu3+掺杂比率的变化而有规律变化,所有样品的发射均处于白光区域.利用近紫外芯片作为激发源,单一基质白色荧光粉Ca9Y1-x-y(PO4)7:xDy3+,yEu3+可应用于白光发光二极管等领域.%A single-phased Ca9Y(PO4)7 : Dy 3+, Eu3+ white-light-emitting phosphors were synthesized by solid-state reaction. X-ray diffractometer and fluorescence spectrophotometer were used to character their structures and photoluminescence properties. XRD results exhibit that Ca9Y(PO4)7: Dy 3+ ,Eu 3+ phosphors belong to rhombohedra structure, Dy3+ and Eu 3+ in the host of Ca9 Y( PO4) 7 replace the site of Y 3+. The emission and excitation spectra show that Dy3+ and Eu3+ can be effectively excited by UV light. The luminescence intensities and chromaticity coordinates can be modified by controlling the concentration and the ratio of doping agent Dy 3+ and Eu 3+ , and all samples' chromaticity coordinates are located in white light area. Therefore, the as-fabricated single-phased Ca9Y(PO4)7 : Dy3+, Eu3+ have potential applications in the field of white light emitting diodes ( LEDs ) .