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Autori: E. Preda, M. Stef, G. Buse, A. Pruna, I. Nicoara
Editorial: IOP Publishing, Physica Scripta , 79, p.035304, 2009.
In the present study, various concentrations of ErF3-doped CaF2 crystals were grown using the vertical Bridgman method. The Judd–Ofelt intensity parameters for f–f transitions of Er3+ ions were determined from optical absorption spectra. The concentration dependence of the intensity parameters radiative transition probability, oscillator strength, branching ratio and radiative lifetime was also investigated. The predicted radiative lifetimes were compared with those of the Er3+ ransitions reported in various hosts. Apart from the green and red emissions, reported by other researchers, a UV (314 nm) emission band was observed, not reported previously.
Cuvinte cheie: Defecte, impuritati, compusi de calciu, Analiza J-O, proprietati optice // Defects, impurities, calcium compounds, J-O Analysis, optical properties