Influence of the electron-lattice coupling for Cr3+ ions in Nb5+ site into congruent co-doped LiNbO3: Cr3+: ZnO crystal
✍ Scribed by G.A. Torchia; O.Martinez Matos; P. Vaveliuk; J.O. Tocho
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 130 KB
- Volume
- 127
- Category
- Article
- ISSN
- 0038-1098
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✦ Synopsis
This paper shows the important role that plays the electron-lattice coupling to represent correctly the energy levels of Cr 3þ ions in Nb 5þ site into congruent LiNbO 3 crystals doped with 5.3% of ZnO. Racah's parameters: B ¼ 646 cm 21 ; C ¼ 3022 cm 21 and crystal field intensity Dq ¼ 1342 cm 21 were determined and the Tanabe -Sugano's diagram was constructed. The characteristics of the absorption and emission spectra of Cr 3þ ions in Nb 5þ site have been explained in terms of the Configurational Co-ordinate model in the harmonic approximation. Huang-Rhys parameter, S ¼ 3:5 and the breathing phonon energy, "v ¼ 460 cm 21 ; are also reported in this work. Different values of breathing phonon for Cr 3þ in Nb 5þ site than in Li þ site could explain the higher luminescent quantum efficiency of Cr 3þ ions located in Nb 5þ site in LiNbO 3 crystals.