SAIP2015

Structural and photoluminescence properties of LaV_1-xP_xO₄:1 mol % Dy³⁺ phosphor powder prepared by solution combustion method

30 Jun 2015, 16:10

1h 50m

Board: A.307

Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster1

Speaker

Mr Selepe Motloung (University of the Free State)

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)?

N/A

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

Prof. O.M 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>

LaV_1-xP_xO₄: 1.0 mol % Dy³⁺ (x=0.0, 0.25, 0.5, 0.75, and 1.0) phosphor powders were prepared by combustion method with different vanadate to phosphate molar concentration. The phosphor powder samples were characterized using x-ray diffraction (XRD) for phase identification. The XRD results for samples with x = 0.0 and x = 1.0 revealed a standard monoclinic structure of LaVO4 and LaPO4 respectively. The diffuse reflectance spectra indicates a broad absorption band around the UV region ranging from 200 nm to 550 nm. The photoluminescence properties were investigated using a Cary Eclipse fluorescence spectrophotometer at the excitation wavelength of 227 nm. Two characteristic emission peaks of Dy³⁺ were observed at λ = 478 nm (blue) and λ = 572 nm (yellow) corresponding to ⁴F_9/2 - ⁶H_15/2 and ⁴F_9/2 - ⁶H_13/2 transition of Dy³⁺, respectively. Furthermore, the PL intensity is the highest when x = 0.5.

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

No

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

Yes