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Measurement of photocatalytic properties of thin-films using novel solid-state luminescent dyes

: Graumann, T.; Neumann, F.

Kondruweit, S.; Szyszka, B.; Pütz, J. ; Fraunhofer-Institut für Schicht- und Oberflächentechnik -IST-, Braunschweig:
8th International Conference on Coatings on Glass and Plastics, ICCG 2010. Advanced Coatings for Large Area or High-Volume Products. Proceedings : June 13-17, 2010, Braunschweig, Germany
Braunschweig: IST, 2010
ISBN: 978-3-00-031387-5
International Conference on Coatings on Glass and Plastics (ICCG) <8, 2010, Braunschweig>
Conference Paper
Fraunhofer IST ()
photocatalysis; titanium dioxide; rare earth metal complexes; luminescence; LED

Measuring the activity and efficiency of photocatalytic materials is an essential approach to assessing and tuning the photocatalytical properties of semiconductors, such as TiO2 or ZnO. A fast and quantitative method to determine the activity is the solid-state degradation of luminescence acts as a benchmark for wavelength-dependent photocatalytic activity to a large variety of materials, such as glass, metals, plastics, tiles or pellets. In this work the dye thin-films were deposited under rough vacuum conditions on magnetron-sputtered titania thin-films and other photocatalytic materials such as TiO2 powder pellets, glass slides and paint. Over a period of 900 s the investigated samples were homogeneously irradiated by high- performance narrow-band LED modules at 365 nm under constant irradiance conditions (E = 1mW/cm2). The initial luminescence brake down of the simultaneous excited dye and photocatalyst was monitored under standard conditions.