Aggregation-Induced Enhanced Red Emission Graphene Quantum Dots for Integrated Fabrication of Luminescent Solar Concentrators
Jiurong Li, Haiguang Zhao, Xiujian Zhao, Xiao Gong
Abstract
Graphene quantum dots (GQDs) commonly suffer from the fluorescence problem of aggregation-caused quenching under high-concentration loading or in the solid state, which seriously hinders the application. Here we report a type of GQDs with red aggregation-induced enhanced emission (AIEE). It is confirmed that the aggregation state of the AIEE GQDs is a J-aggregate. The GQDs/poly(methyl methacrylate) film presented a photoluminescence quantum yield as high as 60.81%, and the record-high performance of luminescent solar concentrators (LSCs) was achieved. The power conversion efficiency (η PCE ) is up to 8.35% and the external optical efficiency (η ext ) is ∼8.99% for the GQD-based LSCs (45 mW/cm 2 ). Even under one sun illumination (100 mW/cm 2 ), the corresponding η PCE and η ext values are 3.12% and 4.52%, respectively. The internal photon efficiency (η int ) of an LSC device is about 5.02%. The synthesis of AIEE GQDs bridges the research gap in the emission mechanism of AIEE in GQDs.