Martínez Matos, ÓscarTorchia, Gustavo AdriánTocho, Jorge OmarKhaidukov, Nikolai Mikhailivich2023-06-202023-06-2020040038-109810.1016/j.ssc.2004.02.006https://hdl.handle.net/20.500.14352/51028© 2004 Elsevier Ltd.We have studied the influence of the electron-lattice coupling on the luminescence quantum yield for Cr^3^+ ions in a Cs_2NaAlF_6 crystal. For this purpose, we analyze the absorption and emission spectra of Cr^3^+ ions by means of the configurational coordinate model in the harmonic approximation. We have found the energy of the breathing phonon associated to Cr^3^+ ions in this host. In our findings we explain the high value of luminescence quantum yield reported previously (near to 70%), if we take into account the uncoupling between the breathing phonon and the normal modes associated to the bulk vibration. The Cr^3^+:Cs_2NaAlF_6 crystals promise to be a potential efficiency tunable laser device in the near infrared (700–900 nm) spectral range.engjournal articlehttp://dx.doi.org/10.1016/j.ssc.2004.02.006http://www.sciencedirect.com/open access535Single-CrystalsLaserÓptica (Física)2209.19 Óptica Física