12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

Synthesis and photoluminescence properties of Tb<sup>3+</sup>-cdoped SrZnAl<sub>2</sub>O<sub>4</sub> nano crystals phosphor prepared via combustion process

13 Jul 2011, 17:00
2h
Asteria

Asteria

Poster Presentation Track A - Condensed Matter Physics and Material Science Poster1

Speaker

Mr Samy Shaat (Department of Physics at University of Free State)

Description

Tb3+-doped SrZnAl2O4 nanocrystalline phosphor with good crystallinity were successfully prepared by a combustion method at a relatively low temperature (500o-C), using urea as fuel and metal nitrates as precursors. The effects of Sr and Zn concentrations on the structure and luminescent properties of the material were investigated. In addition, different concentrations of Tb3+- were also used to determine the concentration that gives maximum intensity. The samples obtained were characterized by X-ray diffraction, scanning electron microscopy (SEM) and transmission electron micrograph (TEM), and photoluminescence (PL) properties of doped samples were investigated. The green emission obtained is associated with 5-D47F5 transitions of Tb3+- at 543 nm. This emission was shown to increase with the concentration of Tb3+- and it quenched at high concentrations. This was attributed to concentration quenching effects. The SrZnAl2O4:Tb3+- phosphor was evaluated for possible application in different types of light emitting devices.

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? Yes
Consider for a student <br> &nbsp; award (Yes / No)? Yes
Level (Hons, MSc, <br> &nbsp; PhD, other)? PhD

Primary author

Mr Samy Shaat (Department of Physics at University of Free State)

Co-authors

Prof. H.C Swart (Department of Physics at University of Free State) Prof. O.M Ntwaeaborwa (Department of Physics at University of Free State)

Presentation Materials