Publication: Influence of the electron-lattice coupling for Cr^3^+ ions in Nb^5^+ site into congruent co-doped LiNbO_3: Cr^3^+: ZnO crystal
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2003-08
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This paper shows the important role that plays the electron-lattice coupling to represent correctly the energy levels of Cr^3^+ ions in Nb^5^+ site into congruent LiN_bO_3 crystals doped with 5.3% of ZnO. Racah's parameters: and crystal field intensity were determined and the Tanabe–Sugano's diagram was constructed. The characteristics of the absorption and emission spectra of Cr^3^+ ions in Nb^5^+ site have been explained in terms of the Configurational Co-ordinate model in the harmonic approximation. Huang–Rhys parameter, S=3.5 and the breathing phonon energy, are also reported in this work. Different values of breathing phonon for Cr^3^+ in Nb^5^+ site than in Li+ site could explain the higher luminescent quantum efficiency of Cr^3^+ ions located in Nb^5^+ site in LiN_bO_3 crystals.
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© 2003 Elsevier Ltd.
G.A. Torchia wishes to acknowledge the CONICET (Argentina) for his fellowship.
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