Tb3+-,Eu3+-activated and Eu3+/Tb3+-coactivated TeO2-Gd2O3-WO3-ZnO(TGWZ)glasses with the density of about 6.60 g/cm3were successfully synthesized by a melt-quenching method.These glass scinti...Tb3+-,Eu3+-activated and Eu3+/Tb3+-coactivated TeO2-Gd2O3-WO3-ZnO(TGWZ)glasses with the density of about 6.60 g/cm3were successfully synthesized by a melt-quenching method.These glass scintillato rs show a line transmittance coefficient in excess of 80%in the strongest green-emitting regions of Tb3+ions.The optimal concentration of incorporated Tb3+and Eu3+ions and the corresponding interaction mechanism are determined in both Tb3+and Eu3+-activated TGWZ glasses.Compared with that of Tb3+-activated TGWZ glasses,the luminous intensity of the Eu3+/Tb3+-coactivated TGWZ glasses is enhanced by 7.6 times,which can be attributed to the effective energy transfer(ET)from Tb3+to Eu3+ions.By investigating the concentration-dependent optical properties of these glasses including transmittance,photoluminescence(excitation and emission spectra),photoluminescence decay,the mechanism of ET in Eu3+/Tb3+-coactivated TGWZ glass scintillators is obtained.Also,the potential scintillation properties of the TGWZ glass scintillators are discussed by X-excited luminescence(XEL)sp ectra and the corresponding X-ray dose response tailored by various current intensity within 0-240μA(which corresponds to 0-40000 mGy).展开更多
Series of TiO 2-ZnO heterojunction composite films with different n(Zn)(Ti) ratios were prepared by UDP450 magnetron sputter ion plating equipment, and the mole ratio of Zn to Ti was controlled by adjusting the cu...Series of TiO 2-ZnO heterojunction composite films with different n(Zn)(Ti) ratios were prepared by UDP450 magnetron sputter ion plating equipment, and the mole ratio of Zn to Ti was controlled by adjusting the current values of sputtering target. The effects of n(Zn)(Ti) on the microstructures of TiO2-ZnO films were investigated by SEM, AFM, Raman and XPS, and their photocatalytic decomposition of methyl orange solutions was evaluated. The results show that an increase in n(Zn)(Ti) typically results in a decrease in the grain size of composite films firstly and then an increase of grain size, while an increase in n(Zn)(Ti) leads to an increase in film roughness firstly and then a decrease in film roughness. Both grain size and roughness of TiO2-ZnO films reach the maximum and minimum at n(Zn)(Ti) of 1/9.3, respectively. The n(Zn)(Ti) shows little effect on the valences of Zn and Ti elements, which mainly exist in the form of TiO2 and ZnO phases. The n(Zn)(Ti) has influence on the amount of anataseutile TiO2 heterojunction in the film. With increase of the n(Zn)(Ti), the absorption intensity of the composite film increases and the absorption region extends to 450 nm, which is redshifted as much as 150 nm in comparison with the pure TiO2 films. However, the photocatalytic abilities of heterogeneous composite films do not depend on the n(Zn)(Ti) but rather on the microstructures of the TiO2-ZnO composite films. Degradation rate of the film reaches the maximum and the photocatalytic decomposition of pollutants works best when n(Zn)(Ti)=1:9.3.展开更多
基金Project supported by the Natural Science Foundation of China(12065010)the Major Science and Technology Research and Development Project of Jiangxi Province(20223AAE01003)+3 种基金the Scientific Research Project of Jiangxi Provincial Department of Education(GJJ211005,GJJ2201656)the Jiangxi Provincial Natural Science Foundation(20224BAB211019,20224BAB211027)the Science and Technology Plan Project of Ji'an City(20233-117685)the opening fund of Key Laboratory of Rare Earths,the Chinese Academy of Sciences。
摘要Tb3+-,Eu3+-activated and Eu3+/Tb3+-coactivated TeO2-Gd2O3-WO3-ZnO(TGWZ)glasses with the density of about 6.60 g/cm3were successfully synthesized by a melt-quenching method.These glass scintillato rs show a line transmittance coefficient in excess of 80%in the strongest green-emitting regions of Tb3+ions.The optimal concentration of incorporated Tb3+and Eu3+ions and the corresponding interaction mechanism are determined in both Tb3+and Eu3+-activated TGWZ glasses.Compared with that of Tb3+-activated TGWZ glasses,the luminous intensity of the Eu3+/Tb3+-coactivated TGWZ glasses is enhanced by 7.6 times,which can be attributed to the effective energy transfer(ET)from Tb3+to Eu3+ions.By investigating the concentration-dependent optical properties of these glasses including transmittance,photoluminescence(excitation and emission spectra),photoluminescence decay,the mechanism of ET in Eu3+/Tb3+-coactivated TGWZ glass scintillators is obtained.Also,the potential scintillation properties of the TGWZ glass scintillators are discussed by X-excited luminescence(XEL)sp ectra and the corresponding X-ray dose response tailored by various current intensity within 0-240μA(which corresponds to 0-40000 mGy).
基金Project (2010JQ6008) supported by the Natural Science Foundation of Shaanxi Province,China
摘要Series of TiO 2-ZnO heterojunction composite films with different n(Zn)(Ti) ratios were prepared by UDP450 magnetron sputter ion plating equipment, and the mole ratio of Zn to Ti was controlled by adjusting the current values of sputtering target. The effects of n(Zn)(Ti) on the microstructures of TiO2-ZnO films were investigated by SEM, AFM, Raman and XPS, and their photocatalytic decomposition of methyl orange solutions was evaluated. The results show that an increase in n(Zn)(Ti) typically results in a decrease in the grain size of composite films firstly and then an increase of grain size, while an increase in n(Zn)(Ti) leads to an increase in film roughness firstly and then a decrease in film roughness. Both grain size and roughness of TiO2-ZnO films reach the maximum and minimum at n(Zn)(Ti) of 1/9.3, respectively. The n(Zn)(Ti) shows little effect on the valences of Zn and Ti elements, which mainly exist in the form of TiO2 and ZnO phases. The n(Zn)(Ti) has influence on the amount of anataseutile TiO2 heterojunction in the film. With increase of the n(Zn)(Ti), the absorption intensity of the composite film increases and the absorption region extends to 450 nm, which is redshifted as much as 150 nm in comparison with the pure TiO2 films. However, the photocatalytic abilities of heterogeneous composite films do not depend on the n(Zn)(Ti) but rather on the microstructures of the TiO2-ZnO composite films. Degradation rate of the film reaches the maximum and the photocatalytic decomposition of pollutants works best when n(Zn)(Ti)=1:9.3.