摘要
采用高温固相法合成了La2-xMgTiO6∶xDy3+和La2-x-yMgTiO6∶xDy3+,yEu3+系列荧光粉,通过X射线衍射对其相结构进行了表征,优化了荧光粉的组成,研究了Dy3+和Eu3+浓度对发光强度的影响,测试了荧光粉的荧光光谱和寿命,研究了Dy3+和Eu3+之间的能量传递机理和能量传递效率。结果表明:所有合成的掺杂荧光粉均为单相物质;La2-xMgTiO6∶xDy3+最佳掺杂浓度为x=0.05;在350 nm近紫外光激发下,La2-x-yMgTiO6∶xDy3+,yEu3+显示出Dy3+的特征黄、蓝光发射和Eu3+的特征红光发射;Dy3+的荧光寿命呈双指数衰减,随着Eu3+浓度的增大,Dy3+的荧光寿命逐渐减小,证明了Dy3+和Eu3+离子之间存在着能量传递;能量传递效率随着Eu3+掺杂浓度的增加而增加,La1.83MgTiO6∶0.05Dy3+,0.12Eu3+荧光粉的能量传递效率为53.9%;改变调节Eu3+的掺杂浓度可以得到从冷白色到暖白色的荧光粉,La1.83MgTiO6∶0.05Dy3+,0.12Eu3+的色坐标为(0.337 3,0.354 4)。
A series of La2-xMgTiO6∶xDy3+and La2-x-yMgTiO6∶xDy3+,yEu3+phosphors were synthesized by high temperature solid-state method.The phase of the products was determined by X-ray diffraction meter and the composition of the phosphors was optimized.The influence of the concentration of Dy3+and Eu3+on the luminescence intensity was studied.The fluorescence spectra and fluorescence lifetime of the phosphors were tested.The energy transfer mechanism and energy transfer efficiency between Dy3+and Eu3+were studied.The results showed that all the as-synthesized doped phosphors were of single phase.The optimum doping concentration of Dy3+in La2-xMgTiO6∶xDy3+was x=0.05.The La2-x-yMgTiO6∶xDy3+,yEu3+phosphors exhibited yellow and blue emissions of Dy3+and characteristic emissions of Eu3+upon 350 nm near ultraviolet light excitation.The fluorescence lifetime decay of Dy3+was double exponential and it decreased with the increase of the concentration of Eu3+,which showed the occurrence of an energy transfer between Dy3+and Eu3+.The energy transfer efficiency increased with the increase of the concentration of Eu3+,which was 53.9%for La1.83MgTiO6∶0.05 Dy3+,0.12 Eu3+.By adjusting the concentration of Dy3+and Eu3+,the phosphor realized the emission from cold-white-light to warm-white-light.The chromaticity coordinates of La1.83MgTiO6∶0.05 Dy3+,0.12 Eu3+were(0.3373,0.3544).
作者
谢会东
谭玉荣
苏彬彬
李洁
赵亚娟
XIE Hui-dong;TAN Yu-rong;SU Bin-bin;LI Jie;ZHAO Ya-juan(School of Science,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2019年第6期713-718,共6页
Chinese Journal of Luminescence
基金
陕西省自然科学基金(2018JM2022)资助项目~~
