Luminescent properties of SrAl2O4 : Eu, Dy material prepared by the gel method

SrAl2O4:Eu,Dy materials were first prepared by the gel method. Compared wit h samples prepared by solid state reactions, the grain size of the gel meth od is greatly reduced to nanometer grade. A clear blue shift occurs in the excitation and emission spectra of nano SrAl2O4:Eu,Dy, of which the peak of the excitation and emission spectra are at 323 and 500 nm respectively. Th e brightness of nano SrAl2O4:Eu,Dy is greatly reduced. The blue shift and t he change of luminescent intensity in nano SrAl2O4:Eu,Dy materials can be a ttributed to the effect of surface energy. (C) 2000 Elsevier Science Ltd. A ll rights reserved.