The samples of europium ions doped titanium dioxide (Eu^3+/TiO2) nanocrystals are synthesized by a modified sol-gel method with hydrothermal treatment. The x-ray diffraction and scanning electron microscopy are use...The samples of europium ions doped titanium dioxide (Eu^3+/TiO2) nanocrystals are synthesized by a modified sol-gel method with hydrothermal treatment. The x-ray diffraction and scanning electron microscopy are used to characterize the sample. The temperature-dependent fluorescence emission effect of Eu^3+-doped samples is investigated. It is found that under the excitation of 514.5nm light, the emission intensity of Eu^3+ reaches a maximum value at 450K among various Eu^3+ dopant concentrations in Eu^3+ /TiO2 nanocrystals. The variation of the emission intensity may be attributed to the photon-assist absorption and the temperature-quenching effect.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 10574121 and 10025420, the Natural Science Foundation of Anhui Province under Grant No 05021015, the Ministry of Education of China, and Chinese Academy of Sciences.
文摘The samples of europium ions doped titanium dioxide (Eu^3+/TiO2) nanocrystals are synthesized by a modified sol-gel method with hydrothermal treatment. The x-ray diffraction and scanning electron microscopy are used to characterize the sample. The temperature-dependent fluorescence emission effect of Eu^3+-doped samples is investigated. It is found that under the excitation of 514.5nm light, the emission intensity of Eu^3+ reaches a maximum value at 450K among various Eu^3+ dopant concentrations in Eu^3+ /TiO2 nanocrystals. The variation of the emission intensity may be attributed to the photon-assist absorption and the temperature-quenching effect.