Luminescent solar concentrators (LSCs) have the potential to serve as energy-harvesting windows in buildings. Although recent advances in nanotechnology have led to the emergence of novel fluorophores such as quantum dots, perovskites and others, the commercialization of such functional glass remains immature due to an insufficient power conversion efficiency. In other words, improvements in fluorophores alone cannot fully maximize the potential of LSCs. Here we introduce a new laminated type of LSC structure where a patterned low-refractive-index medium acts as an optical ‘guard rail’, providing a practically non-decaying path for guiding photons. We also propose the design rules regarding the dimensions of LSCs and the spectral characteristics of fluorophores. Once these rules were applied, we achieved record-high LSC performance. The measured external quantum efficiencies at 450 nm are 45% for a 100 cm² area and 32% for the LSC with an edge aspect ratio of 71. The device efficiency is 7.6%, the highest value ever reported, to the best of our knowledge. These findings may have industrial implications and could accelerate the commercialization of LSCs.

发光太阳能聚光器（LSC）有潜力充当建筑物中的能量收集窗户。尽管纳米技术的最新进展导致了量子点、钙钛矿等新型荧光团的出现，但由于功率转换效率不足，此类功能玻璃的商业化仍不成熟。换句话说，仅靠荧光团的改进并不能充分发挥 LSC 的潜力。在这里，我们介绍了一种新型层压型 LSC 结构，其中图案化的低折射率介质充当光学“护栏”，为引导光子提供几乎不衰减的路径。我们还提出了有关 LSC 尺寸和荧光团光谱特征的设计规则。一旦应用这些规则，我们就实现了创纪录的 LSC 性能。在 450 nm 处测得的外量子效率对于 100 cm ²面积为 45%，对于边缘纵横比为 71 的 LSC 为 32%。据我们所知，器件效率为 7.6%，是有史以来报道的最高值。这些发现可能具有工业意义，并可能加速 LSC 的商业化。