The phosphor BaB8O13：Eu^3＋ were synthesized by solid-state reaction, and their luminescent properties were studied under 254 and 147 nm excitation. The excitation spectrum showed two broad bands in the range of 100-...The phosphor BaB8O13：Eu^3＋ were synthesized by solid-state reaction, and their luminescent properties were studied under 254 and 147 nm excitation. The excitation spectrum showed two broad bands in the range of 100-300 nm： one was the host lattice absorption with the maxima at 160 nm and the other was Ba-O absorption overlapped with the CT band of Eu^3＋, which indicated that the energy of the host lattice absorption could be efficiently transferred to the Eu^3＋. The overlapped bands were tended to separate when monitored by different wavelength, which indicated that at least two Ba^2＋ sites were available in BaB8O13. The emissions of Eu^3＋ （612 nm） and Eu^2＋ （405 nm） were both observed in the emission spectra of BaB8O13：Eu^3＋ under the excitation of either 254 or 147 nm. With the doping concentration of Eu^3＋ increasing, the 612 nm emission was enhanced while 405 nm emission was decreased under 254 nm excitation, which was due to the persistent energy transfer from Eu^2＋ to Eu^3＋. While under 147 nm excitation, the 612 nm emission was quenched and the 405 nm emission was enhanced. It was concluded that the preferential excitation of Eu^2＋ under 147 nm excitation was one of the reasons for this facts.展开更多
基金supported by the Specialized Research Fund for the Doctoral Program of Lanzhou University of Technology (SB01200801)
文摘The phosphor BaB8O13：Eu^3＋ were synthesized by solid-state reaction, and their luminescent properties were studied under 254 and 147 nm excitation. The excitation spectrum showed two broad bands in the range of 100-300 nm： one was the host lattice absorption with the maxima at 160 nm and the other was Ba-O absorption overlapped with the CT band of Eu^3＋, which indicated that the energy of the host lattice absorption could be efficiently transferred to the Eu^3＋. The overlapped bands were tended to separate when monitored by different wavelength, which indicated that at least two Ba^2＋ sites were available in BaB8O13. The emissions of Eu^3＋ （612 nm） and Eu^2＋ （405 nm） were both observed in the emission spectra of BaB8O13：Eu^3＋ under the excitation of either 254 or 147 nm. With the doping concentration of Eu^3＋ increasing, the 612 nm emission was enhanced while 405 nm emission was decreased under 254 nm excitation, which was due to the persistent energy transfer from Eu^2＋ to Eu^3＋. While under 147 nm excitation, the 612 nm emission was quenched and the 405 nm emission was enhanced. It was concluded that the preferential excitation of Eu^2＋ under 147 nm excitation was one of the reasons for this facts.
