Optical spectroscopy study of Cr3+ ion in NaMg3Al(MoO4)5 crystal

Electron absorption, excitation and emission spectra have been measured for Cr3+ ion-doped NaMg3Al(MoO4)5 crystal in the temperature range from 9 to 300 K. The sharp lines of the 2E-4T2 emission and broadband 4T2-4A2 luminescence from strong and weak crystal field Cr3+ sites as well as their temperature dependencies were observed. Below 200 K, Cr3+ ion pairs are detected. The local structure of Cr3+ surroundings is discussed in terms of the spectroscopic results and the crystal field parameters Dq, B and C of the Cr3+ ion are derived. The Huang-Rhys, S, and breathing phonons, ℎω, parameters are reported. The use of the studied crystal as a laser material is briefly analyzed. (copyright 2007 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)