| 785nmLD激发下Tm3+/Ho3+:Y2O3纳米晶的上转换发光 |
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| 引用本文： | 郭艳艳,王庆凯,吴杏华,曾玮,王殿元,王波. 785nmLD激发下Tm3+/Ho3+:Y2O3纳米晶的上转换发光[J]. 武汉大学学报(理学版), 2011, 0(1): 75-78 |
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| 作者姓名： | 郭艳艳 王庆凯 吴杏华 曾玮 王殿元 王波 |
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| 作者单位： | 九江学院机械与材料工程学院;武汉大学物理科学与技术学院;九江学院理学院; |
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| 基金项目： | 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) |
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| 摘 要： | 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.
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| 关 键 词： | 上转换发光 能量传递上转换 激发态吸收 |
Multicolor Upconversion Fluorescence of Tm~(3+)/Ho~(3+):Y_2O_3 Nanocrystals Produced by 785 nm Laser |
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| GUO Yanyan,WANG Qingkai,WU Xinghua,ZENG Wei,WANG Dianyuan,WANG Bo. Multicolor Upconversion Fluorescence of Tm~(3+)/Ho~(3+):Y_2O_3 Nanocrystals Produced by 785 nm Laser[J]. JOurnal of Wuhan University:Natural Science Edition, 2011, 0(1): 75-78 |
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| Authors: | GUO Yanyan WANG Qingkai WU Xinghua ZENG Wei WANG Dianyuan WANG Bo |
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| Affiliation: | GUO Yanyan1,2,WANG Qingkai3,WU Xinghua3,ZENG Wei3,WANG Dianyuan3,WANG Bo2(1.School of Mechanical and Materials Engineering,Jiujiang University,Jiujiang 332005,Jiangxi,China,2.School of Physics and Technology,Wuhan University,Wuhan 430072,Hubei,3.College of Science,China) |
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| Abstract: | 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. |
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| Keywords: | upconversion fluorescence energy transfer upconversion excited state absorption |
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