State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China.
Dalton Trans. 2012 Apr 28;41(16):4890-5. doi: 10.1039/c2dt30064h. Epub 2012 Mar 8.
Water-dispersible Re(3+) doped CeF(3) colloidal nanocrystals with well controllable morphology and high crystallinity have been successfully synthesized through a solvothermal process. The TEM images illustrate that the Re(3+) doped CeF(3) nanocrystals are rectangular (or cubic) with a mean diameter of ~10 nm. The excellent dispersibility in some of the polar solvents including water is achieved by using polyethyleneimine as the capping agent. The amine groups of the polymer chains on one hand bind to the nanocrystal surface; on the other hand the free ones could link to functional materials including bio-molecules. The CeF(3) nanocrystals doped with Tb(3+) and Dy(3+) ions show the characteristic emission of Tb(3+ 5)D(4)-(7)F(J) (J = 6-3, with (5)D(4)-(7)F(5) green emission at 542 nm as the strongest one) and Dy(3+ 4)F(9/2)-(6)H(15/2) (blue-green color at 478 nm) and (4)F(9/2)-(6)H(13/2) (yellow color at 571 nm) transitions, respectively. The energy transfer from Ce(3+) to Tb(3+) and Dy(3+) was also investigated in detail. In vitro studies of Re(3+) doped CeF(3) colloidal nanocrystals on HepG2 cells confirm their excellent biological compatibility. The obtained solid CeF(3) : Tb(3+)/PDMS nanocomposites are very stable and flexible and exhibit strong green photoluminescence upon UV excitation.
通过溶剂热法成功合成了具有良好形貌可控性和高结晶度的水散性 Re(3+)掺杂 CeF(3)胶体纳米晶。TEM 图像表明，Re(3+)掺杂的 CeF(3)纳米晶呈矩形（或立方），平均直径约为 10nm。通过使用聚乙烯亚胺作为封端剂，实现了在一些极性溶剂（包括水）中的优异分散性。聚合物链上的胺基一方面结合在纳米晶表面上；另一方面，游离的胺基可以与包括生物分子在内的功能材料连接。掺杂 Tb(3+)和 Dy(3+)离子的 CeF(3)纳米晶显示出 Tb(3+)的特征发射 5D(4)-(7)F(J)（J = 6-3，最强的是 542nm 的 5D(4)-(7)F(5)绿光发射）和 Dy(3+)的 4F(9/2)-(6)H(15/2)（478nm 的蓝绿色）和 4F(9/2)-(6)H(13/2)（571nm 的黄色）跃迁。还详细研究了 Ce(3+)到 Tb(3+)和 Dy(3+)的能量转移。体外研究 Re(3+)掺杂 CeF(3)胶体纳米晶对 HepG2 细胞的影响证实了它们良好的生物相容性。所得的固体 CeF(3)：Tb(3+)/PDMS 纳米复合材料非常稳定且具有柔韧性，在紫外光激发下表现出强烈的绿光磷光。
