Li Jiurong, Zhao Haiguang, Zhao Xiujian, Gong Xiao
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, P. R. China.
State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, P. R. China.
Nano Lett. 2024 Sep 18;24(37):11722-11729. doi: 10.1021/acs.nanolett.4c03412. Epub 2024 Sep 9.
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) is up to 8.35% and the external optical efficiency (η) is ∼8.99% for the GQD-based LSCs (45 mW/cm). Even under one sun illumination (100 mW/cm), the corresponding η and η values are 3.12% and 4.52%, respectively. The internal photon efficiency (η) 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.
石墨烯量子点（GQDs）在高浓度负载或固态下通常会出现聚集诱导猝灭的荧光问题，这严重阻碍了其应用。在此，我们报道了一种具有红色聚集诱导增强发射（AIEE）的GQDs。证实了AIEE GQDs的聚集态为J-聚集体。GQDs/聚甲基丙烯酸甲酯薄膜的光致发光量子产率高达60.81%，并实现了发光太阳能聚光器（LSCs）的创纪录高性能。基于GQD的LSCs（45 mW/cm）的功率转换效率（η）高达8.35%，外部光学效率（η）约为8.99%。即使在一个太阳光照（100 mW/cm）下，相应的η和η值分别为3.12%和4.52%。LSC器件的内部光子效率（η）约为5.0
