Systematic Synthesis and Optical Property Studies of Monodisperse NaYF4: Yb3+, Er3+ Nanocrystals with Pure Hexagonal Phase

作者：Li, Zhaozhi; Li, Yuebin^*; Zhang, Xianghui; Wang, Lin; Hu, Bo; Zhang, Yi; Gu, Haoshuang^*; Chen, Wei

来源：Science of Advanced Materials, 2017, 9(3-4): 624-629.

DOI：10.1166/sam.2017.2352

• Upconversion Photoluminescence
• NaYF4: Yb3+
• Er3+ Nanocrystals
• Hexagonal Phase

Near infrared (NIR)-to-visible upconversion nanoparticles of pure hexagonal phase beta-NaYF4: Yb3+, Er3+ nanocrystals were successfully synthesized by a high boiling temperature organic phase synthesis strategy in oleic acid (OA), which acted as a ligand. The upconversion photoluminescence intensity of the nanocrystals was modulated by varying the reaction temperature and the concentration of sensitizer Yb3+ ions and activator Er3+ ions. The prepared nanocrystals were investigated by transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and photoluminescence spectroscopy. All the results show that the as-prepared monodispersed upconversion nanocrystals emit high photoluminescence when excited by a 980 nm laser. It was found that the up-conversion emission spectra of beta-NaYF4: Yb3+, Er3+ presented three peaks at about 655, 540, and 521 nm. The optimized concentrations of the sensitizer Yb3+ and the activator Er3+ are 20% and 2% mmol, respectively. These highly efficient nanocrystals have exhibited great potential in bioimaging and photoelectronic devices.

• 出版日期2017-3
• 单位湖北大学