亲水性CIT-NaYF_(4)∶Yb^(3+),Ho^(3+)纳米粒子的制备及其发光性能研究

Preparation of hydrophilic CIT-NaYF_(4)∶Yb^(3+),Ho^(3+)nanoparticles and study on their luminescence properties

采用溶剂热法制备了油溶性稀土掺杂上转换纳米粒子NaYF_(4)∶Yb^(3+),Ho^(3+),并利用TEM、XRD、IR、荧光光谱法等考察了反应温度、反应时间、掺杂比等反应条件对纳米粒子形貌、结构、发光性能的影响。结果表明,在反应温度为300℃、反应时间为50 min、稀土离子掺杂比为NaYF_(4)∶20%Yb^(3+),2%Ho^(3+)条件下,制备出的油溶性NaYF_(4)∶Yb^(3+),Ho^(3+)纳米粒子呈标准六方晶型,尺寸均一、单分散性好,平均粒径为31.55 nm。通过表面配体交换法成功将柠檬酸修饰在其表面,转为亲水性CIT-NaYF_(4)∶Yb^(3+),Ho^(3+)纳米粒子。

NaYF_(4)∶Yb^(3+),Ho^(3+),oil-soluble rare earth doped up-conversion nanoparticles,are prepared through a solvothermal method.The influences of reaction temperature,reaction time and doping ratio on the morphology,structure and luminescence properties of the nanoparticles prepared are investigated by means of TEM,XRD,IR and fluorescence spectroscopy.Results show that the oil soluble NaYF_(4)∶Yb^(3+),Ho^(3+)nanoparticles have standard hexagonal crystals with uniform size and good mono-dispersity,and the average particle size is 31.55 nm when reaction temperature is 300℃,reaction time is 50 min,and rare earth ion doping ratio is higher than NaYF_(4)∶20%Yb^(3+),2%Ho^(3+).Citric acid is successfully modified on the surface of CIT-NaYF_(4)∶Yb^(3+),Ho^(3+)nanoparticles via surface ligand exchange method.