Film for solar concentrator

A film, comprising:

• the film being configured for positioning in a luminescent solar concentrator;
• a plastic first layer, made of PVB (Polyvinyl butyral), with chromophore additives dispersed in the first layer, the first layer having a first refraction index and including an expansive light receiving face surface and a perimeter edge surface oriented at a non-parallel angle to the light receiving face surface, the perimeter edge surface having a smaller area than the light receiving face surface;
• a transparent plastic second layer coupled to of said first layer in a directly engaging manner, the second layer made of PVB without additives, and having a second refraction index less than said first refraction index and a thickness greater than the first layer;
• said second layer being coupled to the light receiving face surface in a directly engaging manner to increase total internal reflection of a luminous radiation inside said first layer, said first layer having the first refraction index increased by the presence of the chromophore additives;
• the perimeter edge surface being configured to transmit light to a photovoltaic cell positioned adjacent the perimeter edge surface;
• wherein the first layer and the second layer are both free of photovoltaic cells.