两亲配体包覆法制备水溶性Mn^(2+)掺杂NaYF_4:Yb^(3+)/Er^(3+)纳米粒子

采用水热法,以稀土硝酸盐为原材料合成了油酸(OA)包覆的Mn^(2+)掺杂Na YF_4:Yb^(3+)/Er^(3+)(Mn^(2+)dopedNa YF_4:Yb^(3+)/Er^(3+))纳米粒子(UCNPs),然后将氨基修饰的聚乙二醇与聚马来酸酐十八烯反应生成的两亲性聚合物m PEG-PMAO作为亲水性配体,通过两亲配体包覆法制备具有水溶性的Mn^(2+)掺杂Na YF_4:Yb^(3+)/Er^(3+)纳米粒子.随后采用透射电子显微镜(TEM)、动态光散射仪(DLS)、X射线衍射仪(XRD)、荧光分光光度计、傅立叶变换红外光谱仪(FT-IR)及热重分析仪(TGA)对合成的样品进行了表征.结果表明,m PEG-PMAO聚合物包覆的Mn^(2+)掺杂Na YF_4:Yb^(3+)/Er^(3+)纳米粒子具有较好的水分散性,且粒子的平均粒径约为17.25 nm.

生物标记用NaYF_4:Yb^(3+),Er_(3+)荧光探针的紫外上转换发光

目的:开发980 nm激发紫外上转换发光的纳米粒子。方法:采用热解法合成Na YF4:Yb3+,Er3+;通过TEM、XRD和荧光光谱等方法对样品进行形貌、结构和发光性能的表征,研究紫外上转换发光性能。结果:Na YF4:Yb3+,Er3+纳米材料可产生波长为321、380和410 nm的紫外上转换发光。结论:980 nm二极管激光器可激发Na YF4:Yb3+,Er3+纳米粒子产生紫外上转换发光。

Sol-gel Processing of a Transparent Upconversion Luminescent Film with β-Na YF_4:Yb^(3+), Er^(3+) Microrods as Activator

β-Na YF4:Yb3+,Er3+ microrods were synthesized through hydrothermal methods. Polyethylene glycol with molecular weight of 6000 was used as surfactant. A series of transparent silica gel films with upconversion luminescence property was prepared through sol-gel method; the prepared β-Na YF4:Yb3+,Er3+ microrods were used as activator. The silica gel films show strong upconversion emission under excitation of 980-nm laser beam.

PEG Assisted Hydrothermal Synthesis of β-Na YF_4:Yb^(3+),Er^(3+) Microrods for Upconversion Photoluminescence Display

β-Na YF4:Yb3+,Er3+ microrods with average length of 10 μm and diameter of 2.5 μm were synthesized through hydrothermal method. Based on the obtained microrods, transparent and flexible film with upconversion luminescence property was prepared through inorganic-organic composition method by using co-polymerization product of isobornylmethacrylate and urethane acrylate as the polymer substrate. The prepared film shows excellent optical transmission in the visible region with average transmission of 81.3% at high doping concentration(2 wt%) of β-Na YF4:Yb3+,Er3+ microrods. By directing and moving NIR laser beam toward the prepared film with high scanning speed, visible light is effectively emitted and various images are able to display.