Eu2+- Mn2+共掺T相硅酸盐荧光粉的制备与发光性能  

Synthesis and Luminescent Properties of Eu2+-Mn2+ Co-doped T-phase Silicate Phosphors

作　　者：宋振[1] 何丽珠[1] 刘泉林[1] Song Zhen;He Lizhu;Liu Quanlin(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学材料科学与工程学院

出　　处：《稀有金属》2019年第11期1243-1250,共8页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51672027,51602019)资助

摘　　要：荧光粉是新一代照明器件的重要组成部分, T相碱土金属硅酸盐荧光粉具有独特的晶体结构,表现出优良的抗发光热猝灭性能。将Mn^2+引入具有青绿色发光的(Ba0.7Ca0.29Eu0.01)2SiO4荧光粉,通过Eu^2+-Mn2+能量传递可以实现Mn^2+的红光发射。通过高温固相反应法制备了具有不同Mn含量的T相碱土金属硅酸盐荧光粉(Ba0.7Ca0.29-zEu0.01Mnz)2SiO4。X射线衍射(XRD)图谱表明,所合成的样品都为纯相,晶格常数随Mn2+含量增多而减小。通过稳态荧光发射光谱、激发光谱和荧光衰减曲线研究Eu^2+-Mn^2+能量传递过程,确认其机制为电多极作用,临界距离为3.433 nm。T相(Ba0.7Ca0.29-zEu0.01Mnz)2SiO4荧光粉在200℃时的发光强度仍可保持室温时的67%~80%,抗发光热猝灭性能优异。通过改变Mn的含量,可以调控Eu^2+的蓝光峰与Mn^2+的红光峰之间的相对比例,从而实现从冷白光到暖白光的单一基质白光发射。Phosphors constitutes an important part in next-generation lighting devices. Owing to the unique crystal structure, T-phase alkaline-earth metal silicate phosphors exhibited excellent thermal luminescence resistance. Incorporating Mn^2+ into(Ba0.7Ca0.29Eu0.01)2SiO4 phosphors with original cyan emission could realize red emission of Mn^2+ by energy transfer between Eu^2+ and Mn^2+. The samples were synthesized by solid-state reaction method with different Mn contents. X-ray diffraction(XRD) patterns confirmed that all the samples were pure phase, with lattice parameters decreasing with increasing Mn content. Steady-state luminescent spectra and decay curves revealed that the energy transfer process between Eu^2+ and Mn^2+ was dominated by electric multipolar interaction, with critical distance of 3.433 nm. At 200 ℃, the luminescent intensity remained 67%~80% of that at room temperature, which showed excellent thermal luminescent resistance for T-phase(Ba0.7Ca0.29-zEu0.01Mnz)2SiO4 phosphors. By changing Mn content, the ratio between blue emission of Eu2+ and red emission of Mn2+ could be modulated to achieve cold to warm white light emission in this single-phased phosphor.

关 键 词：白光LED 荧光粉 能量传递 Eu2+-Mn2+共掺 

分 类 号：O482.31[理学—固体物理]