Luminescence properties of BaB8O13:Eu under UV and VUV excitation
来源期刊：Journal of Rare Earths2009年第3期
论文作者：何玲 王育华 孙卫民
文章页码：385 - 389
摘 要：The phosphor BaB8O13:Eu3+ 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 Eu3+,which indicated that the energy of the host lattice absorption could be efficiently transferred to the Eu3+. The overlapped bands were tended to separate when monitored by different wavelength,which indicated that at least two Ba2+ sites were available in BaB8O13. The emissions of Eu3+（612 nm） and Eu2+（405 nm） were both observed in the emission spectra of BaB8O13:Eu3+ under the excitation of either 254 or 147 nm. With the doping concentration of Eu3+ 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 Eu2+ to Eu3+. 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 Eu2+ under 147 nm excitation was one of the reasons for this facts.
何玲1，王育华2，孙卫民1
1. State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,Lanzhou University of Technology2. Department of Materials Science,School of Physical Science and Technology,Lanzhou University
摘 要：The phosphor BaB8O13:Eu3+ 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 Eu3+,which indicated that the energy of the host lattice absorption could be efficiently transferred to the Eu3+. The overlapped bands were tended to separate when monitored by different wavelength,which indicated that at least two Ba2+ sites were available in BaB8O13. The emissions of Eu3+（612 nm） and Eu2+（405 nm） were both observed in the emission spectra of BaB8O13:Eu3+ under the excitation of either 254 or 147 nm. With the doping concentration of Eu3+ 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 Eu2+ to Eu3+. 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 Eu2+ under 147 nm excitation was one of the reasons for this facts.
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