SAIP2016

Effect of annealing temperature on the structure, morphology and optical properties of Sm³⁺ doped lanthanum phosphovanadate

5 Jul 2016, 16:10

1h 50m

Kramer Law building

Board: A.337

Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster Session (1)

Speaker

Dr Kamohelo George Tshabalala (University of The Free State)

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

No

Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)

No

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD, N/A)?

PhD

Main supervisor (name and email)<br>and his / her institution

Prof OM Ntwaeaborwa

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

This work explores the influence of annealing temperature on the Sm³⁺ activated lanthanum phosphovanadate phosphor powders prepared by solution combustion method. The prepared phosphor powders were annealed at different temperatures (600−1000 °C) for 2 hours. The structure and surface morphology were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) respectively. The XRD analysis indicated that as the annealing temperature is increased, the crystal structure of the prepared phosphor powders changed from monoclinic to tetragonal phase. The SEM images showed different morphologies and sizes. The estimated band gap from diffuse reflectance spectra (DRS) is ~ 3 eV. The excitation spectra showed a strong broad band extending from 200 to 350 nm with maximum at λ = 273 nm.The photoluminescence result showed three emission peaks and they are attributed to ⁶G_5/2 — ⁶H_5/2, ⁶G_5/2 — ⁶H_7/2 and ⁶G_5/2 — ⁶H_9/2 transitions of Sm³⁺ ion.

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes