Synthesis of colloidal LaF_3: 0.04Yb^(3+), 0.01Er^(3+) nanocrystals with green upconversion luminescence

A synthesis of LaF3：0.04Yb^3＋,0.01Er^3＋ nanocrystals with oleic acid as a capping ligand was presemed. The X-Ray Diffraction （XRD） pattern indicated that the power was a single hexagonal phase. Transmission Electron Microscopy （TEM） demonstrated that the average size of the nanocrystals was less than 10 nm, with a narrow size distribution. The nanocrystals were dispersible in nonpolar solvents and form a fully transparent colloidal solution, and the solution was stable for several months without any aggregates. The Yb^3＋-Er^3＋ codoped nanocrystal colloidal solution exhibited a bright green upconversion fluorescence under 980 nm excitation from a diode laser. The nanocrystals were potentially applicable in biolabeling and bioimaging.

Synthesis and Upconversion Luminescence of LaF_3:Yb^(3+),Er^(3+)/SiO_2 Core/Shell Microcrystals

LaF3：Yb^3＋ , Er^＋ microcrystals were synthesized by a hydrothermal method, and then, the LaF3： Yb^3＋ , Er^＋ microcrystals were coated with silica. Phase identification of LaF3： Yb^3＋ , Er^＋ and LaF3： Yb^3＋ , Er^＋/SiO2 was performed via XRD. The TEM image showed that the size of LaF3： Yb^3＋ , Er^＋ was 150 nm and LaF3： Yb^3＋ , Er^＋/SiO2 presented clearly a core/shell structure with 20 nm shell thickness. The upconversion spectra of LaF3： Yb^3＋ , Er^＋ and LaF3： Yb^3＋ , Er^＋/SiO2 in solid state and in ethanol were studied with a 980 nm diode laser as the excitation source. The upconversion spectra showed that the silica shell had little effect on the properties of fluorescence of the LaF3：Yb^3＋ , Er^＋ microcrystals. At the same time, the green luminescence photo of LaF3： Yb3＋, Er3＋/SiO2 in the PBS buffer was obtained, which indicated that the LaF3： Yb^3＋ , Er^＋/SiO2 could be used in biological applications.

LaF3:Yb^3+/Er^3+纳米粒子的合成及上转换发光性质探究

利用离子热方法,以离子液体BmimBF4作为反应介质,成功制备了大小均一、形貌可控、水分散性较好的LaF3:Yb^3+/Er^3+自组装亚微米序列。产物发生了自组装现象,形成了类似于糖葫芦状的有趣形貌。在980 nm激光的照射下,LaF3:Yb^3+/Er^3+纳米粒子发出明亮的黄绿色荧光。这种材料具有理想的自组装形貌、良好的水分散性和明亮的上转换发光,因此使得它在生物标记和显示等领域具有潜在的应用。

LaF3:Yb^3+/Tm^3+、LaF3:Yb^3+/Ho^3+亚微米晶体的制备及表征

采用一步的离子热方法,以离子液体BmimBF4作为反应介质,成功制备了LaF3:Yb^3+/Tm^3+、LaF3:Yb^3+/Ho^3+自组装亚微米序列。产物发生了自组装现象,形成了类似于糖葫芦状的有趣形貌。研究发现,反应时间、反应温度、溶剂组成和混合溶剂中离子液体与水的比例等实验参数对最后产物的形貌有极大影响。这种材料具有理想的自组装形貌、良好的水分散性和明亮的上转换发光,因此使得它在生物标记和显示等领域具有潜在的应用。

LaF_3:Yb^(3+)/Er^(3+)亚微米晶体的自组装机理研究

采用离子热法制备了LaF_3:Yb^(3+)/Er^(3+)亚微米晶体,研究了LaF_3:Yb^(3+)/Er^(3+)亚微米晶体的自组装机理。

LaF_3:Yb^(3+)/Er^(3+)纳米材料的制备及发光性质研究

采用离子热法制备了LaF_3:Yb^(3+)/Er^(3+)纳米材料,研究了LaF_3:Yb^(3+)/Er^(3+)纳米材料的上转换发光性质。