Site-selective spectroscopy of Pr3+ ions in sodium [MATH]-alumina crystals
نویسندگان
چکیده
We report on the results of a low-temperature optical spectroscopy study of Pr3+-exchanged sodium 8-alumina single crystals (Na+/Pr3+ 8A120 ), containing different amounts of luminescent ions, in which excitation and fiuorescence spectra have been carried out in o and n polarization. The 3P9 + 3H4 emission spectra, obtained under broad band excitation, show an intriguing structure consisting of several components even with crystals containing low Pr3+ concentrations. The excitation spectra indicate the presence of at least two sets of different sites, available to Pr3+ in the conduction plane of 8-alumina. Independently of the crystal composition, a quite satisfactory site-selective emission from each sets of centres has been achieved under cw excitation of the 465.8 nm and 476.5 nm lines of an Ar+ ion laser.
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