Martínez Matos, ÓscarTorchia, Gustavo AdriánVaveliuk, PabloTocho, Jorge Omar2023-06-202023-06-202003-080038-109810.1016/S0038-1098(03)00508-8https://hdl.handle.net/20.500.14352/51029© 2003 Elsevier Ltd. G.A. Torchia wishes to acknowledge the CONICET (Argentina) for his fellowship.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.engjournal articlehttp://dx.doi.org/10.1016/S0038-1098(03)00508-8http://www.sciencedirect.com/open access535MGOSpectroscopyLuminescenceCentersÓptica (Física)2209.19 Óptica Física