4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
Paper Review: Initial screening in progress
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Pulsed laser deposited KY3F10:Ho3+ phosphor thin films

Presented by Mr. Nebiyu DEBELO 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.101

Abstract

Thin films of KY_3 F_10:Ho^(3+)phosphor have been successfully prepared by pulsed laser deposition on (100) silicon substrate. The effect of high and low deposition pressures on the structural, morphological and luminescence properties of the films were investigated. The X-ray diffraction (XRD) results show that the films crystallized in tetragonal polycrystalline phase of KY_3 F_10 (in agreement with JCPDS card No 27-0465). Field Emission Scanning Electron Microscope (FE-SEM) and Atomic Force Microscope (AFM) results show clear grains of the deposited films. The EDS elemental mapping result shows Yttrium excess. The thickness of the films was estimated using a weight difference method employing a sensitive electronic microbalance. Green PL emission at 540nm was investigated at four excitation wavelengths; namely, 362, 416 and 454 and 486nm. The highest PL intensity occurred at excitation of 454nm. In addition, red emission was observed at 650 and 750nm for all the excitations. The green emission at 540 nm is ascribed to the 5F4−5I8 and 5S2−5I8 transitions, the red emission at 750 nm are due to the 5F4 −5I7 and 5S2−5I7 transitions of Ho^(3+).

Award

Yes

Level

PhD

Supervisor

Prof. F. B. Dejene, University of the Free State

Paper

Yes

Permission

Yes

Place

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


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