Key Laboratory of Safety Science of Pressurized System (MOE), School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, People's Republic of China.
Nanotechnology. 2011 Jul 1;22(26):265609. doi: 10.1088/0957-4484/22/26/265609. Epub 2011 May 17.
Luminescent lanthanide nanocrystals (NCs) are proposed to be a promising new class of fluorescent labeling agents due to their attractive optical and chemical features including low toxicity, wide photoluminescence (PL) emission and high resistance to photobleaching. In this paper, an ionic-liquid-induced synthesis of Ce(1 - x)Tb(x)F(3) nanoparticle was investigated via utilizing a capillary microreactor. Ionic liquid-[bmim]BF(4) acts as both a fluoride source and stabilizing solvent during the reaction, which was shown to be a key factor that governs luminescence intensity of the obtained nanoparticles. The luminescent properties can be greatly improved by optimizing the volume percentage of [bmim]BF(4). Furthermore, the reaction temperature exerts an influence on the properties of the prepared samples. Experimental results show that the colloidal solutions of Tb(3+)-doped CeF(3) NCs exhibit the characteristic emission of Ce(3+) 5d-4f and Tb(3 + 5) D(4)-(7)F(J) (J = 6-3) transitions with (5)D(4)-(7)F(5) green emission at 542 nm as the strongest peak. The as-prepared samples are found dispersible in water with the quantum yield (in aqueous solution) as 12%, which indicates a potential application on biolabels, light-emitting diodes (LEDs) and redox luminescent switches.
基于其独特的光学和化学性质，如低毒性、宽发射光谱和高抗光漂白性，镧系纳米晶（NCs）有望成为一类新型荧光标记物。本文利用毛细管微反应器研究了一种离子液体诱导的 Ce(1 - x)Tb(x)F(3) 纳米粒子的合成方法。离子液体[bmim]BF(4) 在反应过程中既作为氟源又作为稳定剂，这是控制所得到的纳米粒子发光强度的关键因素。通过优化[bmim]BF(4)的体积百分比，可以大大改善发光性能。此外，反应温度对制备样品的性能也有影响。实验结果表明，Tb(3+)-掺杂 CeF(3) NCs 的胶体溶液表现出 Ce(3+) 5d-4f 和 Tb(3 + 5) D(4)-(7)F(J)（J = 6-3）跃迁的特征发射，其中最强峰为 542nm 的 5D(4)-(7)F(5)绿光发射。所制备的样品在水中具有良好的分散性，量子产率（在水溶液中）为 12%，这表明其在生物标记、发光二极管（LED）和氧化还原发光开关方面有潜在的应用。
