Portal de Periódicos da CAPES

K 5 LaLi 2 F 10 :Er 3+ crystals. Growth, structure and optical properties

1999; IOP Publishing; Volume: 11; Issue: 27 Linguagem: Inglês

10.1088/0953-8984/11/27/302

1361-648X

G. Dominiak‐Dzik, Stanisław Gołąb, М. Балука, A. Pietraszko, K. Hermanowicz,

Solid State Laser Technologies

Single crystals of K5LaLi2F10:Er3+ and K5LaLi2F10 were synthesized and the structural determination was made by x-ray diffraction analysis. The structure is orthorhombic with space group Pnma. The unit cell parameters are: a = 20.775, b = 7.822 and c = 6.963 Å. The infrared transmission and Raman scattering spectra of oriented single crystals were measured and discussed in terms of factor group analysis and x-ray structure. A vibrational assignment is proposed. Preliminary optical properties of Er3+ ions in K5LaLi2F10 crystals have been investigated using absorption, luminescence and lifetime measurements in the 5-300 K temperature range. The low temperature absorption and luminescence spectra of Er3+ have allowed us to identify the Stark levels of low-lying multiplets. The luminescence observed at 5 K has been attributed to the 4S3/24I15/2 (18 300 cm-1), 4F9/24I15/2 (15 000 cm-1), 4S3/24I13/2 (11800 cm-1) and 4I11/24I15/2 (10000 cm-1) transitions. The lifetimes of selected excited states were measured at 5 and 300 K temperature. The obtained data gave the first insight into the luminescent properties of Er3+ ions in the fluorine surroundings in K5LaLi2F10 crystals.