【摘 要】
：
LaF3:Yb3 +,Er3 + nanoparticles were successfully synthesized using solvothermal treatment,and LaF3:Yb3 +,Er3 +/SiO2 core/shell nanoparticles were also prepared
【机 构】
：
School of Materials Science and Engineering,College of Physics Science and Technology
论文部分内容阅读
LaF3:Yb3 +,Er3 + nanoparticles were successfully synthesized using solvothermal treatment,and LaF3:Yb3 +,Er3 +/SiO2 core/shell nanoparticles were also prepared with reverse microemulsion technique.The crystal structure,morphology and photoluminescence properties of as-prepared core/shell nanoparticles were investigated by X-ray diffraction,transmission electron microscopy and fluorescence spectrophotometer.The results showed that LaF3:Yb3 +,Er3 + nanoparticles are of hexagonal structure and SiO2 shell is amorphous.The size of LaF3:Yb3+,Er3+ nanoparticles is 13 nm and the LaF3:Yb3+,Er3+/SiO2 nanoparticles present clearly a core/shell structure with 12 nm shell thickness.The solubility of LaF3:Yb3+,Er3+ nanocrystals in water and the biocompatibility are both improved by the SiO2 shell.The upconversion luminescence spectra suggested that the SiO2 shell has small effect on the upconversion luminescence properties of the LaF3:Yb3+,Er3+ nanocrystals.The core/shell structure LaF3:Yb3 +,Er3 +/SiO2 nanoparticles are expected to be used in biological applications.
其他文献
In the present study,2024 aluminum alloy specimen was anodized in acetic acid and oxalic acid electrolytcs.Effects of the currcnt dcnsity on thc microstructure
A fast label-equivalence-based connected components labeling algorithm is proposed in this paper.It is a combination of two existing efficient methods,which are
Tuned mass dampers (TMDs) have been widely used in recent years to mitigate structural vibration.However,the damping mechanisms employed in the TMDs are mostly
While introducing foreign advanced technology and cooperating with Chinese famous research institutes,the high-speed vehicles are designed and take the major ta
A new compact bandpass filter based on two meandered parallel-coupled lines of different lengths in shunt is presented,using the signal-interference technique,t
To evaluate and improve the real-time performance of Ethernet for plant automation (EPA) industrial Ethernet,the real-time performance of EPA periodic data tran
In open and dynamic Internet environment,multi-periods quality of service (QoS),multiple decision-makers based on heterogeneous QoS models and uncertainty weigh
In this paper,we focus on antenna array design for mobile phone with finite volume and propose a novel antenna element structure by capacitive feeding and capac
For super high-rise buildings,the vibration period of the basic mode is several seconds,and it is very close to the period of the fluctuating wind.The damping o