Luminescent solar concentrators (LSCs) have recently emerged as valuable candidates for the realization of aesthetically pleasing solar windows for near-zero-energy consumption buildings. The growing demand by the building-integrated photovoltaic sector is urging the development of sustainable production methods that minimize the use of polluting organic solvents and hazardous materials, while still enabling industrial-grade LSCs. Here, we introduce a new class of benzothieno-benzothiophene (BTBT) derivatives as highly efficient reabsorption-free emitters for transparent LSCs featuring high stability and a solvent-free chemical access with sustainability factor as low as 21, 10 to 50 times lower than conventional LSC emitters. By embedding our BTBT emitters in optical-grade polymeric waveguides, we produced large-area (40 cm × 40 cm) LSCs with optical power efficiency as high as 3% (corresponding to an optical quantum efficiency of 54%). These results represent an important advancement toward sustainable solar glazing systems for green architecture.

发光太阳能集中器（LSC）最近成为实现接近零能耗建筑的美观玻璃窗的有价值的候选者。建筑集成光伏行业的需求不断增长，这催促了可持续生产方法的发展，该方法应尽量减少使用污染性有机溶剂和有害物质，同时仍可实现工业级LSC。在这里，我们介绍一种新型的苯并噻吩并苯并噻吩（BTBT）衍生物，它是透明LSC的高效无重吸收发射体，具有高稳定性和无溶剂的化学可及性，其可持续性因子低至21，比常规低10至50倍LSC发射器。通过将我们的BTBT发射器嵌入光学级聚合物波导中，我们生产了大面积（40 cm×40 cm）LSC，其光功率效率高达3％（相当于54％的光量子效率）。这些结果代表了针对绿色建筑的可持续太阳能玻璃系统的重要进步。