9-13 July 2012
Synthesis and characterization of green SrAl2O4:Tb3+ phosphor using solution combustion method
Presented by Ms. Kewele Emily FOKA on 10 Jul 2012 from 17:30 to 19:30
Type: Poster Presentation
Session: Poster Session
Track: Track A - Division for Condensed Matter Physics and Materials
SrAl2O4:Tb3+ phosphors doped with different concentration of Tb were synthesized by solution combustion method. The crystalline structure, morphology and luminescent properties of the phosphors were studied by X-ray diffraction (XRD), scanning electron microscope (SEM) techniques and photoluminescence (PL) spectroscopy respectively. The XRD analysis reveal polycrystalline monoclinic structure and the calculated average particle sizes ranged between 80 and 90 nm. SEM images show non uniform and irregular shapes of the particles. The Tb3+ doped SrAl2O4 phosphor shows a green emission when illuminated by 229 nm. The emission spectra show the weak blue emission in the region of 415—459 nm and strong green emission in 489—622 nm. The 4f—4f emission from 5D4 to 7FJ (J= 6, 5, 4, 3) states of Tb3+ are found at 489, 543, 585 and 622 nm, respectively. Other emission peaks from the 5D3 to 7FJ (J=5, 4, and 3) transitions were also found at 415, 436, and 459nm. The decay curves of SrAl2O4:Tb3+ phosphor showed the rapid decay and long afterglow. Intensity of the phosphorescent decreases as the concentration of terbium ions increased in host lattice.
Dejene BF (email@example.com) University of the Free State