Speaker
Mr
Sefako John Mofokeng
(University of South Africa)
Description
Up-converting luminescent nanoparticles are promising and advantageous alternative to possess anti-Stokes shift emission by up-converting near infrared (NIR) excitation light (980 nm) to emit visible light [1, 2]. In the present work, ZnTiO3 nanophosphor doped with different concentrations of Er3+ ions were synthesized via a conventional solid state reaction method using metal oxides as precursors. The crystal structure, particle morphology, optical and up-conversion luminescence properties of ZnTiO3:Er3+ nanophosphor were analyzed using various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) UV-Vis spectroscopy and photoluminecsent (PL) spectroscopy, respectively. The X-ray diffraction (XRD) patterns confirmed crystallization of hexagonal ZnTiO3 phase. In addition, photoluminescence properties showed green (2H11/2, 4S3/2 → 4I15/2 transitions) and red (4F9/2 → 4I15/2 transition) emissions from Er3+ when excited in the NIR region with an excitation wavelength of 980 nm diode-laser. The interaction mechanisms involved in the up-conversion process of ZnTiO3:Er3+ nanophosphor is discussed with the help of an energy-level schematic.
Key words: Nano-phosphor, up-conversion luminescence, Er3+ ions.
References
[1] L. Lei, J. Zhu, G. Xia, H. Feng, H. Zhang and Y. Han. Talanta 162 (2017) 339–344.
[2] E. Palo, M. Tuomisto, I. Hyppanen, H.C. Swart, J. Holsa, T. Soukka and M. Lastusaari. Journal of Luminescence 185 (2017) 125–131.
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
PhD
Main supervisor (name and email)<br>and his / her institution
Prof Mokhotjwa Simon Dhlamini
Email address:dhlamms@unisa.ac.za
Institution: University of South Africa
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Primary author
Mr
Sefako John Mofokeng
(University of South Africa)
Co-authors
Prof.
Bakang Moses Mothudi
(University of South Africa)
Mr
Luyanda Lunga Noto
(University of Free State (Student))
Prof.
Mokhotjwa Simon Dhlamini
(University of South Africa)
Prof.
Odirileng Martin Ntwaeaborwa
(University of the Witwatersrand)
