Solid-state photoluminescent silicone-carbon dots/dendrimer composites for highly efficient luminescent solar concentrators

[Display omitted] •Si-CDs were designed to conquer the aggregation-caused quenching of CDs.•Two silicone dendrimers were synthesized to match Si-CDs for realizing good compatibility.•The LSCs were prepared by dispersing Si-CDs in the silicone dendrimers on the glass substrate.•The external optical e...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2021-10, Vol.422, p.130158, Article 130158
Hauptverfasser: Wu, Jun, Xin, Wei, Wu, Yuhan, Zhan, Yuan, Li, Jinhua, Wang, Jianying, Huang, Shiqiang, Wang, Xianbao
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Sprache:eng
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Zusammenfassung:[Display omitted] •Si-CDs were designed to conquer the aggregation-caused quenching of CDs.•Two silicone dendrimers were synthesized to match Si-CDs for realizing good compatibility.•The LSCs were prepared by dispersing Si-CDs in the silicone dendrimers on the glass substrate.•The external optical efficiency of LSC (25 × 25 × 1 mm) can reach as high as 7.58%. Luminescent solar concentrators (LSCs) with high performances depend on not only the luminescent materials, but their dispersed polymer matrixes. However, carbon dots (CDs)-based LSCs suffer from aggregation-caused fluorescence quenching with the increased concentration of CDs in polymer matrix. To solve this issue, a novel solid-state photoluminescent (PL) silicone-carbon dots (Si-CDs) composites was synthesized by one-step solvothermal treatment of citric acid, dicyandiamide and 3-aminopropyltriethoxysilane (APTES). The solid-state PL Si-CDs showed yellow-green emission at 525 nm under excitation of UV light. For better dispersion of Si-CDs, two types of silicone dendrimers (denoted as D1 and D2) were designed and synthesized via a transesterification and hydrosilylation reaction method. The structure differences between D1 and D2 are the contents of phenyl and methoxy groups. Remarkably, silicone dendrimers with high loading of Si-CDs (up to 35 wt%) could be obtained owing to their good compatibility. Single-layered LSCs could be prepared easily by directly casting the above mixtures on glass substrates followed by room temperature curing. The external optical efficiency (ηopt) of 7.58%, 5.38% had been achieved from D1 and D2 based LSCs (25 × 25 × 1 mm), respectively. This work provides a convenient method for preparing highly efficient LSCs, posing great potential in various specific applications.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2021.130158