[Electrooptical properties of nanoscale and bulk SrAl2O4: Eu, Dy].
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. There-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.
Duan
Xiao-Xia
XX
Key Laboratory of Luminescence and Optical Information, Ministry of Education, and Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. duanxiaoxia@126.com
Huang
Shi-Hua
SH
Teng
Feng
F
Xu
Zheng
Z
Dong
Li-Qiang
LQ