[Preparation and photoluminescence investigation of europium-doped zinc oxide nanocrystalline].
Europium-doped zinc oxide nanocrystalline was successfully prepared by sol-gel process. Photoluminescence spectrum (PL), Photoluminescence excitation spectrum(PLE), and X-ray diffraction pattern(XRD) of nanocrystalline ZnO : Eu3+ with excitation wavelength 395 nm were measured at room temperature. The XRD pattern indicates that nanocrystalline ZnO : Eu3+ has a hexagonal wurtzite structure and is polycrystalline. The mean grain size of nanocrystalline ZnO : Eu3+ was calculated by Debye-Scherrer formula. The luminescence process of Eu(3+) -doped zinc oxide nanocrystalline was investigate using PL and PLE. Emission of 5D0 --> 7F1 (595 nm), 5D0 --> 7F3 (653 nm), 5D0 --> 7F2 (611 nm) of Eu3+ ions, and a weak and wide visible band of ZnO were observed. Also, the photoluminescence of nanocrystalline ZnO : Eu3+ exhibits a blue-shift. An energy transfer from excited states of ZnO hosts to doped Eu3+ ions centers was disclosed by the fact that that photoluminescence intensity maximum of nanocrystalline ZnO : Eu3+ changs with the doping concentration of Eu3+.
Song
Guo-Li
GL
Department of Physics, Harbin University, Harbin 150086, China. S.gl@263.net
Sun
Kai-Xia
KX
Yang
You-Tong
YT