LUMINESCENT SOLAR CONCENTRATOR SYSTEM
The invention relates to a Luminescent Solar Concentrator system ( 400 ) and a method for collecting and concentrating external light, particularly sunlight (λ 1 , λ 2 ). The external light is collected by a luminescent converter component ( 410 ) having a thickness D and a ratio R=a x /a c between the absorption coefficient ax for sunlight and the reabsorption coefficient ac for luminescence light. Due to the luminescent material comprised by said converter component ( 410 ), at least a part of the external light is converted into luminescence light. Moreover, light propagating within the converter component ( 410 ) is extracted from it at light extraction sites (EX) having distances W≦0.1·R·D from each other. Light extraction components may for example comprise slanted mirroring surfaces ( 414 ) and/or optical elements in contact to the converter component.
1 . A Luminescent Solar Concentrator system, comprising:
a) a luminescent converter component having a thickness D between an outer surface and inner surface and a ratio R between the absorption coefficient (a x ) for sunlight and the reabsorption coefficient (a c ) for luminescence light;
b) a plurality of light extraction components, for extracting light from the luminescent converter component through its inner surface, wherein said components are located at extraction sites (EX) having distances W≦0.1·R·D from each other.
2 . A method for collecting and concentrating external light, particularly sunlight, comprising the following steps:
a) collecting external light (λ 1 , λ 2 ) by a luminescent converter component having a thickness D between an outer surface and an inner surface and a ratio R between the absorption coefficient (a x ) for sunlight and the reabsorption coefficient (a c ) for luminescence light;
b) extracting light from the luminescent converter component through its inner surface at extraction sites (EX) having distances W≦0.1·R·D from each other.
3 . The Luminescent Solar Concentrator system according to claim 1 ,
characterized in that the distances W between the light extraction sites (EX) range between about 0.02·R·D and about 0.05·R·D.
4 . The Luminescent Solar Concentrator system according to claim 1 ,
characterized in that the thickness D of the luminescent converter component ranges between about 3000 μam and 100 μm.
5 . The Luminescent Solar Concentrator system according to claim 1 ,
characterized in that at least one light extraction component comprises a mirroring surface of the luminescent converter component.
6 . The Luminescent Solar Concentrator system according to claim 5 ,
characterized in that the mirroring surface is slanted with respect to the inner surface.
7 . The Luminescent Solar Concentrator system according to claim 5 ,
characterized in that the mirroring surface has a wavelength-selective reflectivity.
8 . The Luminescent Solar Concentrator system according to claim 1 ,
characterized in that at least one light extraction component comprises a transparent optical element contacting the inner surface of the luminescent converter component.
9 . The Luminescent Solar Concentrator system according to claim 1 ,
characterized in that there is at least one solar cell that receives extracted light.
10 . The Luminescent Solar Concentrator system or the method according to claim 9 ,
characterized in that the solar cell is located at an extraction site (EX).
11 . The Luminescent Solar Concentrator system or the method according to claim 9 ,
characterized in that it comprises an optical system for guiding extracted light to the solar cell.
12 . The Luminescent Solar Concentrator system or the method according to claim 11 ,
characterized in that the optical system comprises at least one collimator for redirecting light extracted at an extraction site (EX) such that it is substantially in alignment with a given direction.
13 . The Luminescent Solar Concentrator system or the method according to claim 11 ,
characterized in that the optical system comprises at least one lens for focusing extracted light onto the solar cell.
14 . The Luminescent Solar Concentrator system according to claim 1 ,
characterized in that the luminescent converter component has a curved three-dimensional shape.