Speaker
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
no
Main supervisor (name and email)<br>and his / her institution
Dr Mothudi, mothubm@unisa.ac.za, UNISA
Apply to be<br> considered for a student <br> award (Yes / No)?
no
Abstract content <br> (Max 300 words)
Alkaline earth aluminate hosts have attracted a lot interest, due to their stable crystal structure, high physical and chemical stability. Strontium Aluminate (SrAl2O4) host material have been proven to be efficient with a wide band gap, which offers the possibility of generating broad band emission. In this study SrAl2O4 doped with Eu2+, Dy3+ and Mn2+ phosphor powders were prepared by combustion method at 600°C. The X-ray diffraction (XRD) patterns of the samples were performed using a Bruker AXS D8 advanced automatic diffractometer with Cu-Kα radiation (λ = 1.5418 A), operating at 40 kV and 30 mA. The photoluminescence (PL) and photoluminescence excitation (PLE) spectra were measured at room temperature using a Spex Fluorolog-3 spectrofluorometer (Instruments S.A., N.J., U.S.A) equipped with a 450 W Xe light source and double excitation monochromators.
The PL emission spectra of SrAl2O4 doped with Eu2+ and Dy3+ shows the influence of excitation wavelength on the emission spectra of the sample. The broad and sharp emission bands observed are typical transitions of Eu2+ and Eu3+ respectively. The broad emission bands from these spectra are attributed to the typical transitions from the lowest 2D level of the excited 4f65d1 configuration to the ground 8S7/2 level of the 4f7 configuration of Eu2+ ion. The sharp emission lines can be attributed to the (5D0 - 7F1-5) electronic transition of Eu3+ ions present in the host matrix. The particle morphologies of the powders were investigated using Zeiss High resolution SEM.
