Browsing by Author "Debije, Michael G."

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Polarization-independent filters for luminescent solar concentrators
(2011-01-10)
de Boer, Dick K. G.
;
Lin, Chi-Wen
;
Giesbers, Merijn P.
;
Cornelissen, Hugo J.
;
Debije, Michael G.
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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3541543]