Spectroscopic properties of Pr3+ ions in Ge-In-S chalcogenide glasses

audiovizuální tvorba

angličtina

Homogeneous and stable glasses from (80GeS220In2S3)100-x(Pr2S3)x system, where x=0-7, were prepared using conventional method (direct synthesis from elements in evacuated silica ampoules). In the transmission spectra of studied glasses, narrow absorption bands, which were assigned to the intra-f electron transitions from the ground to higher energy levels of Pr3+ ions, are identified. The experimental values of oscillator strengths of individual electron transitions were calculated from the transmission spectra. The Judd-Ofelt parameters ( 2, 4, 6) of Pr3+ ions in studied glasses were determined from the values of oscillator strengths. Absolute minimization as well as relative minimization fitting procedures using five or six transitions were applied for the determination of Judd-Ofelt parameters. Obtained values of Judd-Ofelt parameters are discussed in relation with different concentration of Pr3+ ions in studied glasses and with the type of calculation. The values of probabilities of radiative spontaneous electron transitions between Pr3+ energy levels and other important quantities characterizing Pr3+ ions were determined using Judd-Ofelt parameters. The photoluminescence spectra of studied glasses were measured. From the results of Judd-Ofelt analysis, the individual bands of emission spectra were assigned to radiative spontaneous electron transitions between discrete energy states of Pr3+ ions.

rare ions, Judd-Ofelt theory, chalcogenide glasses, Raman and Infrared spectroscopy, thermal properties

REPKOVÁ, M.; FRUMAR, M.; NĚMEC, P.

20. 6. 2005

Rumunsko, Sinaia

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