  Luminescent solar concentrators (LSCs) have shown the ability to realize
spectral conversion, which could tailor solar spectrum to better match
photosynthesis requirements. However, conventional LSCs are designed to trap,
rather than extract, spectrally converted light. Here, we propose an effective
method for improving outcoupling efficiency, based on protruded and extruded
micro-cone arrays patterned on the bottom surface of LSCs. Using Monte-Carlo
ray tracing, we estimate a maximum external quantum efficiency (EQE) of 37.73%
for our Horticulture-LSC (HLSC), corresponding to 53.78% improvement relatively
to conventional, planar LSCs. Additionally, structured HLSCs provide diffuse
light, beneficial for plant growth. Our micro-patterned surfaces provide a
solution to light trapping in LSCs and a foundation for practical application
of HLSC.
