Speaker
Ms
Prettier Morongoa Maleka
(Yes)
Description
Cerium (Ce3+) doped alkaline-sodium-phosphate or NaMPO4 (where M= Mg, Ca, Sr and Ba) phosphors were prepared by solution combustion method with different doping concentrations of Ce3+ (0.5 mol %, 1.0 mol % and 1.5 mol %). X-ray powder diffraction (XRD) and scanning electron microscope (SEM), were used to analyse the crystalline structure and particle morphology of the samples, respectively. The optical properties including reflectance, excitation and emission were investigated using UV-Vis absorption spectroscopy and photoluminescence (PL) spectroscopy while stretching modes and electronic and chemical composition were analyzed using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The XRD and SEM results confirm that the samples contain mixture of phases of crystals. The excitation spectrum of the phosphors were characterized by broad band extending from 250 to 400 nm. The PL emission spectrum of the sample showed a broad band located between 310 and 400 nm in the UV range, which is due to the allowed 4f05d1 → 4f1 5d0transition of Ce3+ ions. The effects of Mg2+, Ca2+, Sr2+ and Ba2+ substitution on the particle morphology and photoluminescence emission intensity will be reported.
Main supervisor (name and email)<br>and his / her institution
Ntwaeaborwa O.M ntwaeab@gmail.com University of the Witwatersrand
Swart HC swarthc@ufs.ac.za university of Free state
Reddy K krishr@uj.ac.za university of Johannesburg
Avula B balakrishna.veera@gmail.com university of free state
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
No
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
MSc
Primary author
Ms
Prettier Morongoa Maleka
(Yes)
