Abstract
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 language | English |
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Article number | 021111 |
Pages (from-to) | 021111-1/3 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 98 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2011 |