18 May 2010 Optimizing wavelength-selective filters for luminescent solar concentrators
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Abstract
In a Luminescent Solar Concentrator, short-wavelength light is converted by a luminescent material into longwavelength light, which is light guided towards a photovoltaic cell. In principle, a Luminescent Solar Concentrator allows for high concentration, since the heat generated by the conversion process can be used to lower the entropy of light. However, less controlled loss mechanisms prevent high concentration factors in practice. One important loss mechanism is the escape of luminescent radiation into directions that do not stay inside the light guide. To reduce this amount, wavelength-selective filters can be applied that reflect the luminescent radiation back into the light guide while transmitting the incident sunlight. However, a filter optimized for reflecting as much as possible luminescent radiation will reflect part of the incident sunlight at high angles. Depending on the luminophore properties, it may be possible to design a suitable filter. In this paper, the interdependence of the luminophore and filter properties will be clarified and quantified using simulations. Optimal luminophore-filter combinations will be discussed, as well as the feasibility to realize them in practice.
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Dick K. G. de Boer, "Optimizing wavelength-selective filters for luminescent solar concentrators", Proc. SPIE 7725, Photonics for Solar Energy Systems III, 77250Q (18 May 2010); doi: 10.1117/12.853846; https://doi.org/10.1117/12.853846
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