SAIP2015

Laser excitation studies and crystal-field analysis of ZnO:Tb³⁺ and ZnO:Eu³⁺ powders

30 Jun 2015, 16:10

1h 50m

Board: A.417

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

Speaker

Mr NKOSIPHILE ANDILE BHEBHE (UNIVERSITY OF THE WITWATERSRAND)

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

YES

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

Yes

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

Yes

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

Dr. Marjorie Mujaji
Marjorie.Mujaji@wits.ac.za
University of the Witwatersrand

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>

Results from laser excitation studies of Tb³⁺ ions and Eu³⁺ ions in zinc oxide (ZnO) powders are presented; rare-earth doped ZnO (ZnO:RE³⁺) is currently of great interest as a prospective solid-state laser matrix and for optoelectronic device applications. The chemical bath deposition technique was utilized for synthesizing the ZnO:Tb³⁺ and ZnO:Eu³⁺ powders. Photoluminescence spectra of the pelleted samples were obtained in the 460 – 900 nm range. The spectra exhibit sharp emission lines superimposed on a broad emission background with 457.9 nm, 476.5 nm and 488.0 nm argon laser-line excitation. The sharp peaks are attributed to the ⁵D₄ → ⁷F_J (J = 0, 1, 2, 3, 4, 5, 6) and the ⁵D₀ → ⁷F_J (J = 0, 1, 2, 3, 4) electronic transitions of Tb³⁺ and Eu³⁺, respectively. Crystal-field energy levels for the Tb³⁺ ion and the Eu³⁺ ion occupying a C_3v symmetry site were deduced.

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

MSc