4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
The Proceedings of SAIP2016 published on 24 December 2017
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Enhanced photoluminescence emission from Dy 3+ and Tb3+ activated lanthanum phosphovanadate

Presented by Mr. Selepe Joel MOTLOUNG on 5 Jul 2016 from 16:10 to 18:00
Type: Poster Presentation
Track: Track A - Division for Physics of Condensed Matter and Materials
Board #: A.472

Abstract

Dysprosium and terbium doped lanthanum phosphovanadate (LaV<sub>0.25</sub>P<sub>0.75</sub>O<sub>4</sub>: Dy<sup>3+</sup> and Tb<sup>3+</sup>) phosphor powders were synthesized by the solution combustion method. X-ray diffraction (XRD) was used investigate phase formation of the prepared phosphor powder. Scanning electron microscopy (SEM) images revealed that the prepared powder consisted of different shapes and sizes. Elemental composition was examined by energy dispersive x-ray spectroscopy (EDS), while the stretching mode frequencies were determined by Fourier transform infrared spectroscopy (FTIR). The band gap was estimated from the diffuse reflectance spectra. The excitation spectra of both dysprosium and terbium doped samples showed a strong broad band extending from 200 to 350 nm with the maximum at λ ≈ 274 nm. Photoluminescence emission spectra for dysprosium doped samples showed two peaks at 480 nm (<sup>4</sup> F<sub>9/2</sub> —<sup>6</sup> H<sub>13/2</sub>) and 573 nm (<sup>4</sup> F<sub>9/2</sub> —<sup>6</sup> H<sub>15/2</sub>) corresponding to Dy<sup>3+</sup> emission while four emission peaks were observed for terbium doped samples at 490 nm (<sup>5</sup> D<sub>2</sub> — <sup>7</sup> F<sub>5</sub>), 544 nm (<sup>5</sup> D<sub>2</sub> — <sup>7</sup> F<sub>5</sub>), 586 nm (<sup>5</sup> D<sub>2</sub> — <sup>7</sup> F<sub>2</sub>) and 623nm (<sup>5</sup> D<sub>2</sub> — <sup>7</sup> F<sub>5</sub>) corresponding to transitions of Tb<sup>3+</sup> ions. These photoluminescence results further revealed that the PL intensity increases with an increase in temperature.

Award

No

Level

N/A

Supervisor

Prof O.M Ntwaeaborwa ntwaeb@ufs.ac.za University of the Free State

Paper

Yes

Permission

No

Place

Location: Kramer Law building
Address: UCT Middle Campus Cape Town
Room:


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