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Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Glasses (original: DF, joined by CPP, DY)

CPP 32.3: Vortrag

Mittwoch, 2. April 2014, 12:25–12:45, WIL B321

Optical properties of trivalent rare-earth ions in barium borate glasses — •Sebastian Loos1, Franziska Steudel2, Bernd Ahrens1,2, and Stefan Schweizer1,21South Westphalia University of Applied Sciences, Lübecker Ring 2, 59494 Soest — 2Fraunhofer Institute for Mechanics of Materials IWM, Walter-Hülse-Str. 1, 06120 Halle (Saale)

Rare-earth doped glasses gain increasing importance in optical devices, such as fibre lasers or light emitting diodes. Luminescence properties of rare-earth ions are well-known, but absolute photoluminescence quantum efficiencies have been insufficiently studied. In this work, series of Sm3+, Eu3+, and Tb3+ doped barium borate glasses are investigated for their potential application as frequency down-converters in solid state lighting and photovoltaics. Photoluminescence quantum efficiencies have been analyzed for rare-earth doping levels up to 5 at.%. The best values of more than 50% are achieved for Eu3+ doping. To increase the photoluminescence quantum efficiency even further, the Sm3+-doped samples have been co-doped with a second rare-earth ion, namely Eu3+ or Tb3+. Here, energy transfer processes between Sm3+ and the second rare-earth ion become important; they are discussed in detail.

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