| 光谱学与光谱分析 |
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| Electrooptical Properties of Nanoscale and Bulk SrAl2O4∶Eu, Dy |
| DUAN Xiao-xia, HUANG Shi-hua*, TENG Feng, XU Zheng,DONG Li-qiang |
| Key Laboratory of Luminescence and Optical Information, Ministry of Education, and Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China |
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Abstract Nanoscale and bulk SrAl2O4∶Eu2+, Dy3+ were prepared respectively by auto-combustion of citrate gelatin and high temperature solid state method. The crystalline structure was examined by X-ray diffraction (XRD). The current-voltage characteristic was measured with a Keithley source meter 2 410. The VUV spectra were carried out with VUV spectrometer. The result showed that light irradiation increased the current, which indicates that some electrons are excited to the conduction band of host lattice. VUV excitation spectrum of nanoscale SrAl2O4∶Eu2+, Dy3+ shifts to the shorter wavelength relative to bulk material because it has narrower bandgap. As a result, the current of nanoscale material is weaker than that of the bulk one.
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Received: 2008-11-18
Accepted: 2009-02-22
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Corresponding Authors:
HUANG Shi-hua
E-mail: shhuang@bjtu.edu.cn
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