785nmLD激发下Tm³⁺/Ho³⁺:Y₂O₃纳米晶的上转换发光

785nmLD激发下Tm 3+ /Ho 3+ :Y 2 O 3 纳米晶的上转换发光 Multicolor Upconversion Fluorescence of Tm 3+ /Ho 3+ :Y 2 O 3 Nanocrystals Produced by 785 nm Laser 郭艳艳 GUO Yanyan1 1 2 first-author 王庆凯 WANG Qingkai3 3 吴杏华 WU Xinghua3 3 曾玮 ZENG Wei3 3 王殿元 WANG Dianyuan3 3 王波 WANG Bo2 2 九江学院机械与材料工程学院 九江学院机械与材料工程学院 School of Mechanical and Materials Engineering,Jiujiang University School of Mechanical and Materials Engineering,Jiujiang University 武汉大学物理科学与技术学院 武汉大学物理科学与技术学院 School of Physics and Technology,Wuhan University School of Physics and Technology,Wuhan University 九江学院理学院 九江学院理学院 College of Science,Jiujiang University College of Science,Jiujiang University 以甘氨酸为燃烧剂,采用低温燃烧法制备了Tm3+,Ho3+共掺杂的Y2O3纳米晶粉末,通过X射线衍射和透射电子显微镜（TEM）对样品的结构、形貌和粒径进行了分析和表征.本文以785nm LD为激发光,研究了样品的上转换发光性质,实验结果得到了峰值波长为487nm（蓝色）,548nm（绿色）,659nm和695nm（红色）上转换发光.经过分析表明,上述发光分别指5F3→5I8（Ho3+）+1 G4→3 H6（Tm3+）,（5F4,5S2）→5I8（Ho3+）,5F5→5I8（Ho3+）和3F3→3 H6（Tm3+）跃迁.通过对上转换发光强度和激发光功率的关系研究,揭示出其均为双光子过程,并且能量传递上转换和激发态吸收是上转换发光的主要机制.由于其高效的上转换发光性能,该材料在荧光标记、三维立体显示等方面有着潜在的应用前景. 1%Tm3+-doped,5%Ho3+-doped and 1%Tm3+,5%Ho3+ co-doped Y2O3 nanocrystals were synthesized by solution combustion method.The particle size,structure and morphology of the samples were characterized by X-ray diffraction and transmission electron micrograph.Under 785 nm laser excitation,multicolor upconversion emissions near 487 nm（blue）,548 nm（green）,659 nm and 695 nm（red） were observed in Tm3+,Ho3+:Y2O3.These emission bands were assigned to be 5F3→5I8（Ho3+）+1G4→3H6（Tm3+）,（5F4,5S2）→5I8（Ho3+）,5F5→5I8（Ho3+） and 3F3→3H6（Tm3+）,respectively.The power dependence of upconverted emission intensity was measured to explain the upconversion mechanism.Several cross-relaxation energy transfer processes and excited state absorption（ESA） were found to be responsible for the observed upconversion emissions. 上转换发光 能量传递上转换 激发态吸收 upconversion fluorescence energy transfer upconversion excited state absorption 10.14188/j.1671-8836.2011.01.003 O482.31 国家自然科学基金资助项目（51062008）;江西省教育厅青年科学基金资助项目（GJJ09601）;九江学院科研项目（08kj31） 2011-01-01 2021-04-01 1 57