Solid state reaction method was used to
prepare rare earth’s powder samples of strontium
cerium oxide (Sr2CeO4) that are doped with(Dy3+) ion.
Laser diffraction particle size analysis, Fourier
Transform Infrared spectrometer (FTIR) technique,
photoluminescence (PL) technique, scanning electron
microscope (SEM), and X-ray diffraction (XRD)
techniques were used to characterize these samples that
are fired at 12000C for 3h. Also, it has been disclosed by
the XRD patterns that an orthorhombic crystal
structure is exhibited by the Sr2CeO4:Dy3+phosphor.
According to the room temperature photoluminescence
(PL) analysis there exists three excitation peaks that are
situated at 250, 260 and 270nm as well as an intense
blue emission is showed by samples at 470nm and
yellow emission at 575nm. Also, it has been shown by
the SEM images that samples fired at 12000C were
highly agglomerated with multi layered structure.
Sample’s mean diameter is indicated by particle size
distribution histogram and molecule’s chemical bonds
are determined by FTIR. It was also revealed by
Sr2CeO4:Dy3+CIE (Commission international de
l’eclairage) that there is a variation in emission from
blue to yellow and finally to orange when dysprosium
concentration is increased.
Keywords : Particle size distribution histogram; Yellow emission; Blue emission; Solid state reaction method; Sr2CeO4