Abstract: Solar collection devices make use of (a) an absorption body including luminescent material and (b) photovoltaic (PV) cells placed at the edges of the absorption body. The luminescent material absorbs solar radiation and generates luminescent radiation of a different wavelength. The PV cells receive the luminescent radiation and convert it into electrical energy. The devices have one or more of the following characteristics:—(a) the luminescent material is such that part of the radiation is converted into electrical energy and part of the radiation is transmitted; (b) the PV cells are bifacial, i.e. will generate electricity in response to radiation from both sides; (c) the PV cells have electrodes which do not lie between the PV cell and the luminescent body; and (d) the constitution and/or dimensions of the PV cells and/or of the luminescent body are selected so as to provide a desired result, e.g.