Dresden 2011 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Glasses and Glass Transition I (jointly with DY, DF)
CPP 30.11: Talk
Wednesday, March 16, 2011, 12:45–13:00, KÖN Farb
Multi-phonon relaxation in Eu-doped fluorozirconate-based glasses and glass ceramics — •Charlotte Pfau1, Christian Bohley1, Manuela Miclea1, Paul-Tiberiu Miclea2,3, and Stefan Schweizer2,1 — 1Centre for Innovation Competence SiLi-nano®, Martin Luther University of Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3, 06120 Halle (Saale) — 2Fraunhofer Center for Silicon Photovoltaics, Walter-Hülse-Str. 1, 06120 Halle — 3Institute of Physics, Martin-Luther-University of Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120 Halle
Eu-doped fluorozirconate(FZ)-based glasses are of interest for various fluorescence applications such as photon down-conversion layers for high efficiency solar cells or ionizing radiation imaging plates. Multi-phonon relaxation (MPR) is one of the major quenching processes of the rare-earth (RE)-related fluorescence therein. The MPR is significantly reduced in hosts providing low phonon frequencies such as FZ-based glasses and glass ceramics; the latter contain barium halide nanocrystals with even lower phonon frequencies. However, the MPR rate depends not only on the phonon frequency, but also on the electron-phonon coupling between the rare-earth ion and the host lattice. The local vibrational environment of the RE ion is investigated by phonon sideband spectroscopy. To analyze the vibrational spectra and their influence on the fluorescence properties, a series of Eu-doped FZ-based glasses and glass ceramics has been studied by Raman, phonon sideband, and fluorescence spectroscopy. The MPR rate is determined for the levels involved in the fluorescence process.