Spectral Splitting Using Luminescent Solar Concentrator Lightguides

Luminescent solar concentrators (LSCs) are promising devices for visually‐striking, low‐cost photovoltaic (PV) energy generation, absorbing sunlight with luminophores and directing their narrowband emission to the edges of a lightguide where small‐area, spectrally‐tuned PVs can be applied. Incorporating multiple dyes broadens the absorption spectrum and enables more efficient solar energy capture, but the resulting wider emission bandwidth complicates spectral matching with PV cells. To overcome this challenge, this work demonstrates the first proof‐of‐concept implementation of solar spectrum splitting in a multi‐dye LSC by controlling edge‐emitted wavelengths using cholesteric reflectors attached to the narrow sides of the LSC. In addition, luminophore alignment was employed to maximize emission along orthogonal edges, further enhancing spectral selectivity. Edge‐emission measurements confirmed broadband cholesteric reflectors enable controlled spectral splitting, while the alignment of luminophores improves directional emission. Overall, these findings demonstrate that integrating spectral‐control elements into a multi‐dye LSC is a potentially effective strategy for selective PV energy conversion and represents a scalable pathway toward next‐generation spectrum‐splitting solar devices.