Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 8: Glasses I (joint session DY/DF)

DY 8.2: Vortrag

Dienstag, 24. März 2009, 10:20–10:40, WIL B321

Fluorescence efficiency of samarium-doped glasses and glass ceramics — •Marcel Dyrba¹, Bernd Ahrens^2,3, Paul T. Miclea^1,3, and Stefan Schweizer^1,3 — ¹Institute of Physics, Martin-Luther-University of Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120 Halle (Saale), Germany — ²Department of Physics, University of Paderborn, Warburger Str. 100, 33098 Paderborn, Germany — ³Fraunhofer Center for Silicon Photovoltaics, Walter-Hülse-Str. 1, 06120 Halle (Saale), Germany

Optically active glasses and glass ceramics offer a broad range of applications; the functionality can be modified by appropriate doping and thermal processing performed after the glass production. Fluorescence from samarium in glasses has attracted much attention in the past two decades, in particular for studies on spectral-hole burning, excited state absorption, and laser properties. Samarium can enter the glass matrix either in its divalent form and/or as a trivalent ion.

The most efficient fluorescent glasses are characterized by low-phonon energies, a critical parameter leading to reduced non-radiative losses and thus to increased fluorescence efficiencies. However, the phonon frequency is not only dependent on the composition of the matrix the optically-active ion is incorporated into but also by the size of the matrix; in rare-earth doped nanocrystals an increased fluorescence efficiency is found. In this work, we compare the fluorescence efficiency of Sm²⁺/Sm³⁺ in different glass systems such as borate glasses, fluorozirconate glasses, or oxyfluoride glasses.