• Absorption, excitation and fluorescence spectra of thallium activated cesium bromide

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      https://www.ias.ac.in/article/fulltext/pram/012/03/0291-0299

    • Keywords

       

      Luminescence; cesium bromide; thallium; fluorescence spectra

    • Abstract

       

      Absorption, excitation and fluorescence spectra of T1+ doped cesium bromide have been investigated at various thallium concentrations. At very low thallium concentration two absorption bands are obtained at 225 nm and 264 nm. With rise of thallium concentration additional absorption bands are obtained at 230, 244, 258, 270 and 285 nm. A single bell-shaped fluorescence band at 357 nm in the ultraviolet region is obtained at low thallium concentration. Two additional visible fluorescence bands appear at 440 and 540 nm with rise in thallium content. The excitation spectra for ultraviolet emission band and visible emission bands are found to be different. Accordingly the ultraviolet emission band is attributed to the characteristic A emission in T1+ ion and the visible bands are attributed to dimer centers havingD4h site symmetry.

    • Author Affiliations

       

      V B Sharan1 D N S Srivastwa1 S C Sen1 2

      1. Physics Department, H. B. Technological Institute, Kanpur - 208 002
      2. Physics Department, Indian Institute of Technology, Kanpur - 208 016
    • Dates

       
  • Pramana – Journal of Physics | News

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