Phonon - assisted optical bands of nanosized powdery SrAl2O4:Eu2+ crystals: Evidence of a multimode Pekarian

Nazarov, M.; Brik, M.G.; Spassky, D.; Tsukerblat, B.; Palii, A.; NorNazida, A.; Ahmad-Fauzi, M.N.

Авторы: Nazarov M., Brik M.G., Spassky D., Tsukerblat B., Palii A., NorNazida A., Ahmad-Fauzi M.N.
Журнал: Physics Letters, Section A: General, Atomic and Solid State Physics
Том: 377
Год издания: 2013
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 3170
Последняя страница: 3178
DOI: 10.1016/j.physleta.2013.09.025
Аннотация: A stoichiometric powder composed of nanosized grains of SrAl2O4:Eu2+ was synthesized by combustion method at 500◦C with the subsequent calcination at 1000◦C. Thezero-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 parametera =2S=10 and frequency¯hω=509cm−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 (multimodePekarian). 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.
Добавил в систему: Спасский Дмитрий Андреевич

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Phonon - assisted optical bands of nanosized powdery SrAl2O4:Eu2+ crystals: Evidence of a multimode Pekarianстатья

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