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MM: Fachverband Metall- und Materialphysik
MM 21: Transport - Ions and Electrons
MM 21.4: Vortrag
Dienstag, 17. März 2020, 11:00–11:15, IFW B
Quantitative analysis of non-radiative relaxation processes in luminescent borate glass by infrared thermography — •Nils J. Ziegeler1, Peter W. Nolte2, and Stefan Schweizer1,2 — 1Department of Electrical Engineering, South Westphalia University of Applied Sciences, Lübecker Ring 2, 59494 Soest, Germany — 2Fraunhofer Application Center for Inorganic Phosphors, Branch Lab of Fraunhofer Institute for Microstructure of Materials and Systems IMWS, Lübecker Ring 2, 59494 Soest, Germany
Lanthanide-doped borate glasses represent an interesting class of luminescent materials. Though these systems offer high photoluminescence quantum efficiency (QE) values, a significant part of the excitation power is converted to heat due to unavoidable non-radiative relaxation processes. In this contribution, the amount of generated heat is estimated from infrared thermography investigations. For this, the glass sample’s surface temperature is monitored under continuous optical excitation. To obtain the volumetric heat rate, the spatially resolved temperature data are analysed on the basis of the partial differential heat equation. Experiments on barium borate glass with different lanthanide doping concentrations are performed. A comparison with optical measurements shows that the approach to determine the QE indirectly by estimating the amount of non-radiative relaxation processes is very promising and particularly interesting for QE measurements at high temperatures.