摘要
利用热溶剂法制备NaLaF_4:Yb^(3+)/Er^(3+)/Dy^(3+)光磁双功能纳米晶。结合能级跃迁图,阐述Dy^(3+)的6FJ和6HJ系列能级与Er^(3+)之间的能量传递及由此引起的特殊光调制现象。研究结果表明:样品在波长为980nm的红外光子激发下可以发射中心波长为522nm和547nm的绿光;随着激发光功率增大,绿光发射强度也相应增强;调节Dy^(3+)的掺杂摩尔百分比,可以同时调制样品的上转换发光和顺磁特性;随着Dy^(3+)的摩尔百分比从0增加到5%,样品的522nm发光相对于547nm发光峰逐渐增强;若进一步增加Dy^(3+)的摩尔百分比到10%,其相对强度反而减弱。随着Dy^(3+)的摩尔百分比从0增大到10%,样品的顺磁性单调提升,但伴随着总体发光强度衰减。
NaLaF4：Yb3＋/Er3＋/Dy3＋bifunctional magnetic-optical nanocrystals were synthesized by solvothermal method. Combined with the energy level transition diagram, the energy transfer between the 6FJ and 6HJ series level of Dy3＋and Er3＋ was discussed. The results show that the energy transfer can cause a special magnetic-optical modulation phenomenon. Green light is emitted which is centered at 522 nm and 547 nm under the excitation of 980 nm infrared light. With the increase of the laser power, the intensity of the green emission increases. The upconversion luminescence and paramagnetic characteristics of the samples can be modulated by adjusting the doping concentration of Dy3＋.As the concentration of Dy3＋increases from 0 to 5%, emission peaks centered at 522 nm gradually increase with respect to the 547 nm emission peaks. If the concentration of Dy3＋is further increased to 10%, the relative intensity decreases. With the increase of the concentration of Dy3＋ from 0 to 10%, the paramagnetic properties of the sample are enhanced, but the overall emission intensity is attenuated.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第11期3715-3720,共6页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(61376076
61274026
21301058
61377024)
湖南省教育厅资助项目(14B060)
湖南省科技计划项目(2014FJ2017
2013FJ2011)~~
关键词
光磁
双功能
稀土离子
掺杂
magnetic-optical
bifunctional
rare earth ions
doping
