Phonon-assisted optical bands of nanosized powdery SrAl2O 4:Eu2+ crystals: Evidence of a multimode Pekarian

M. Nazarov, M. G. Brik, D. Spassky, B. Tsukerblat, A. Palii, A. Nor Nazida, M. N. Ahmad-Fauzi

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13 Scopus citations


A stoichiometric powder composed of nanosized grains of SrAl 2O4:Eu2+ was synthesized by combustion method at 500 C with the subsequent calcination at 1000 C. The zero-phonon line position, parameter of the Stokes shift, heat release factor and effective phonon energy were studied experimentally and analyzed in the framework of the multimode Pekar-Huang-Rhys model. Experimental data show that the optical 4f-5d transitions in Eu2+ ion exhibit a broad asymmetric electron-vibrational bands with a pronounced structure near the maxima. The form-function of the absorption and luminescence bands are theoretically analyzed in the framework of the model of the linear electron-vibrational interaction assuming strong coupling with the local vibration (estimated Pekar-Huang-Rhys parameter a=2S=10 and frequency ω=509 cm-1) and relatively weak interaction with the crystal phonons. The last results in an effective temperature dependent broadening of the discrete lines corresponding to the local vibrations and to a specific shape of the whole phonon assisted band (multimode Pekarian). Providing specific interrelation between the key parameters the calculated absorption and luminescence bands exhibit peculiar temperature dependent structured peaks in a qualitative agreement with the experimental data.

Original languageEnglish
Pages (from-to)3170-3178
Number of pages9
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number43
StatePublished - 9 Dec 2013


  • Activated crystals
  • Luminescence
  • Multiphonon bands
  • Phosphors

ASJC Scopus subject areas

  • Physics and Astronomy (all)


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