Study of electron-vibrational interaction and concentration quenching effect of Cu+ ions in lithium based sulphate phosphors

• EVI and concentration quenching study of Cu+ ion in Lithium based sulfate phosphors are carried out for the first time.
• The main parameters of EVI, such as the Stokes shift, Huang-Rhys factor and zero-phonon line positions, were estimated.
• Their validity was established by modeling the shape of the emission spectra.
• The relation between intensity per activator and concentration is studied.

The objective of this work is to study electron-vibrational interaction (EVI) and concentration quenching and their manifestation in experimental photoluminescence spectra of Cu+ ion in various lithium based phosphors namely, Li2SO4, LiNaSO4 and LiKSO4. The main parameters of EVI, such as the Stokes shift, Huang-Rhys factor and zero-phonon line positions, were estimated. The studied systems shows strong electron lattice coupling. The validity of results was established by modeling the shape of the emission spectra, which was found to be in good agreement with experimental photoluminescence spectra. The concentration quenching study is also carried out for these compounds. The studied systems correspond to the nearest neighbor energy transfer mechanism.

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