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DF: Fachverband Dielektrische Festkörper

DF 16: Glasses (Joint Session with CPP and CY)

DF 16.3: 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 Ahrens^1,2, and Stefan Schweizer^1,2 — ¹South 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.