Polarization-independent filters for luminescent solar concentrators

D.K.G. Boer, de, C.-W. Lin, M. P. Giesbers, H.J. Cornelissen, M.G. Debije, P.P.C. Verbunt, D.J. Broer

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The efficiency of luminescent solar concentrators could be enhanced by use of wavelength-selective filters, reducing the amount of luminescent light lost. To accomplish this, polarization-independent filters with reflectivity >97% were made by combining layers of cholesteric liquid crystals, either a right- with a left-handed layer, or two right-handed layers with a half-lambda waveplate. Normal cholesteric filters have a reflection bandwidth which is narrower than the spectral and angular range of the luminescent emission. The reflection band is broadened from 80 to 200 nm by employing a pitch gradient in the cholesteric layer. The measured transmission bands compare well with calculations.
Original languageEnglish
Article number021111
Pages (from-to)021111-1/3
Number of pages3
JournalApplied Physics Letters
Issue number2
Publication statusPublished - 2011


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