Journal of Chemistry

Journal of Chemistry / 2010 / Article

Open Access

Volume 7 |Article ID 971465 | 8 pages | https://doi.org/10.1155/2010/971465

Optical Studies on KBr:Tl and KCl-Br:Tl Mixed Crystals

Received18 Aug 2009
Accepted10 Oct 2009

Abstract

Optical absorption spectra of KBr:Tl+ (0.0125 mol%) single crystals shows A, B and C bands around 258, 220 and 210 nm respectively. In KCl0.1Br0.9 :Tl+ (0.0125 mol%) mixed crystals exhibit slightly broadening of the A-band towards lower wavelength side. The broadening of the absorption spectra are suggested to be due to some complex Tl+ centers involving Br- and Cl- ions formed in the mixed crystals. When excited at A, B and C-bands of Tl+ ions, PL of KBr:Tl+ showed emission band around 320 with a prominent shoulder around 365 nm. In KCl0.1Br0.9 mixed crystals the shoulder around 365 nm is not prominent due to the perturbing influence of Cl- ions. Addition bands in the excitation spectra are attributed to the presence of Tl+ dimmers. PSL observed in X-ray irradiated crystals resembled their respective PL emissions indicating that PSL in them is due to Tl+ ions.

Copyright © 2010 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

408 Views | 584 Downloads | 0 Citations
 PDF  Download Citation  Citation
 Order printed copiesOrder