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Proceedings Paper

Organic wavelength selective mirrors for luminescent solar concentrators
Author(s): Paul P. C. Verbunt; Michael G. Debije; Dirk J. Broer; Cees W. M. Bastiaansen; Dick K. G. de Boer
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Paper Abstract

Organic polymeric chiral nematic liquid crystalline (cholesteric) wavelength selective mirrors can increase the efficiency of luminescent solar concentrators (LSCs) when they are illuminated with direct sunlight normal to the device. However, due to the angular dependence of the reflection band, at larger incidence angles the cholesterics reflect away some incoming sunlight that could have been absorbed by the luminophore. As a result, the increase in LSC efficiency after application of a cholesteric reflector drops if the light incident to the device is at angles larger than 30 degrees. The cholesteric reflectors still have a positive impact on device performance for light incident up to 45-50 degrees but at larger angles efficiency decreases when a cholesteric reflector is added. This affects the performance of the LSC device when illuminated with indirect incident light, especially when the incident light has a large contribution of photons above 45 degrees.

Paper Details

Date Published: 2 May 2012
PDF: 7 pages
Proc. SPIE 8438, Photonics for Solar Energy Systems IV, 843805 (2 May 2012); doi: 10.1117/12.921814
Show Author Affiliations
Paul P. C. Verbunt, Eindhoven Univ. of Technology (Netherlands)
Michael G. Debije, Eindhoven Univ. of Technology (Netherlands)
Dirk J. Broer, Eindhoven Univ. of Technology (Netherlands)
Cees W. M. Bastiaansen, Eindhoven Univ. of Technology (Netherlands)
Queen Mary Univ. of London (United Kingdom)
Dick K. G. de Boer, Philips Research (Netherlands)

Published in SPIE Proceedings Vol. 8438:
Photonics for Solar Energy Systems IV
Ralf Wehrspohn; Andreas Gombert, Editor(s)

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