Reflux synthesis, formation mechanism, and photoluminescence performance of monodisperse Y_2O_3:Eu~(3+) nanospheres

摘要

Monodisperse Y_2O_3:Eu~(3+) nanospheres have been successfully synthesized by a low-temperature reflux method assisted by cetyltrimethyl ammonium bromide (CTAB). The products were characterized by X-ray diffraction spectroscopy, transmission electron microscopy, scanning electron microscopy, Fourier-transform infrared spectrophotometer, thermogravimetric and differential thermal analysis, and X-ray photoelectron spectroscopy. It is demonstrated that the size of Y_2O_3:Eu~(3+) nanospheres can be controlled from 80 to 140 nm with narrow size distribution by adjusting the amount of CTAB. A possible formation mechanism of Y_2O_3:Eu~(3+) nanospheres has been proposed. The photoluminescence analysis shows that Y_2O_3:Eu~(3+) nanospheres obtained have a strong red emission peak of Eu~(3+) ions at around 611 nm, due to the ~5D_0→~ 7F_2 forced electric dipole transition of Eu~(3+) ions. It is found that the photoluminescence performance of the obtained Y_2O_3:Eu~(3+) nanospheres is stronger than that of the Y_2O_3:Eu~(3+) nanorods synthesized by a traditional hydrothermal route.