Luminescent concentrators (LCs) are devices which capture and enhance the brightness of incident light. They are designed to absorb light over a large area and then redirect it towards a smaller, more confined region, where it can be utilised more efficiently. The basic structure of an LC consists of a transparent material, known as the matrix, embedded with luminescent materials, often organic dyes. When photons of light enter the matrix, they are absorbed by the luminescent materials, which then re-emit the light at a longer wavelength.