Optical Studies on KBr:Tl and KCl‐Br:Tl Mixed Crystals | Zendy

P. Eswaran | Zendy; A. Anbagi | Zendy; Samuthira Nagarajan | Zendy

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

Author(s) -

P. Eswaran,

A. Anbagi,

Samuthira Nagarajan

Publication year - 2009

Publication title -

journal of chemistry

Language(s) - English

Resource type - Journals

eISSN - 2090-9063

pISSN - 2090-9071

DOI - 10.1155/2010/971465

Subject(s) - chemistry , ion , excited state , spectral line , absorption (acoustics) , absorption band , analytical chemistry (journal) , irradiation , absorption spectroscopy , wavelength , excitation , photoluminescence , psl , atomic physics , optics , physics , geometry , electrical engineering , mathematics , organic chemistry , chromatography , astronomy , nuclear physics , engineering

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

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