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  • Title: Increased efficiency of luminescent solar concentrators after application of organic wavelength selective mirrors.
    Author: Verbunt PP, Tsoi S, Debije MG, Broer DJ, Bastiaansen CW, Lin CW, de Boer DK.
    Journal: Opt Express; 2012 Sep 10; 20 Suppl 5():A655-68. PubMed ID: 23037532.
    Abstract:
    Organic wavelength-selective mirrors are used to reduce the loss of emitted photons through the surface of a luminescent solar concentrator (LSC). A theoretical calculation suggests that application of a 400 nm broad reflector on top of an LSC containing BASF Lumogen Red 305 as a luminophore can reflect 91% of all surface emitted photons back into the device. Used in this way, such broad reflectors could increase the edge-emission efficiency of the LSC by up to 66%. Similarly, 175 nm broad reflectors could increase efficiency up to 45%. Measurements demonstrate more limited effectiveness and dependency on the peak absorbance of the LSC. At higher absorbance, the increased number of internal re-absorption events reduces the effectiveness of the reflectors, leading to a maximum increase in LSC efficiency of ~5% for an LSC with a peak absorbance of 1. Reducing re-absorption by reducing dye concentration or the coverage of the luminophore coating results in an increase in LSC efficiency of up to 30% and 27%, respectively.
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