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Proceedings Paper

Sol-gel glasses: a new material for solar fluorescent planar concentrators?
Author(s): Andreas Hinsch; Armin Zastrow
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Paper Abstract

Inorganic glasses prepared by the 'cold' chemical sol-gel process can present an alternative host material for organic fluorescent dyes. We report on measurements done on thin Si02 layers prepared as sol-gels and doped with various dyes on a glass substrate. The preparation is done by dip-coating of the substrate in the corresponding alcoxide solutions. Good quality layers without crazing after drying are achieved with a thickness of up to 1-2 microns. The measurements include absorption measurements (UV to IR), fluorescence and excitation measurements (visible to NIR), and measurements of photo-decomposition. The optical properties of the dye molecules in the layer and in the sol-gel solutions are studied as a function of dye concentration and changes in the thermal treatment of the layers. The results are examined for their applicability to FPC's. Further we report on small silver islands (submicron size) brought into the sol-gel solution as stabilized colloids or by chemical reduction of Ag+ salts. According to theoretical predictions, the electromagnetic interaction of silver surface plasmons and dye molecules can result, under certain conditions, in an enhanced fluorescence quantum efficiency and photostability of the dye.

Paper Details

Date Published: 1 August 1990
PDF: 10 pages
Proc. SPIE 1272, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IX, (1 August 1990); doi: 10.1117/12.20446
Show Author Affiliations
Andreas Hinsch, Fraunhofer Institute for Solar Energy Systems (Germany)
Armin Zastrow, Fraunhofer Institute for Solar Energy Systems (Germany)

Published in SPIE Proceedings Vol. 1272:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IX
Claes-Goeran Granqvist; Carl M. Lampert, Editor(s)

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