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