Green, sustainable, and economical synthesis of fluorescent nitrogen-doped carbon quantum dots for applications in optical displays and light-emitting diodes. (November 2022)

• Record Type: Journal Article
• Authors: Sharma, V.D.; Vishal, Vishal; Chandan, G.; Bhatia, A.; Chakrabarti, S.; Bera, M.K.
• Is Part Of: Materials today sustainability. Volume 19(2022)
• Publication Date: 2022-11
• Subjects: Biomaterials -- Nitrogen-doped CQDs -- Cissus quadrangularis -- down conversion LED -- Optical display; Materials science -- Environmental aspects -- Periodicals; Sustainable engineering -- Periodicals; 620.11
• DOI: 10.1016/j.mtsust.2022.100184
• Languages: English
• ISSNs: 2589-2347

Abstract

Abstract: Fluorescent carbon quantum dots (CQDs) have attracted increasing attention in recent years because of their multiple benefits, including low toxicity, biocompatibility, simplicity of functionalization, eco-friendly production, and a wide range of applications. However, expensive precursors and manufacture, as well as a time-consuming procedure, limit their economical design, which must be addressed. We provide a straightforward, cost-effective, eco-friendly, and long-term synthesis method for fluorescent CQDs based on an affordable medicinal plant precursor such as Cissus quadrangularis. The nitrogen-doped CQDs produced had a homogenous size distribution (4–9 nm) and green fluorescent nature, as well as strong photo-stability, excellent water solubility, and a quantum yield of roughly 5%. The existence of a large fraction of sp 2 and sp 3 -carbon groups, as well as other hydrophilic oxygen and nitrogen-containing groups, was confirmed. Potential fluorescence processes are also hypothesized. Furthermore, we report a successful demonstration of N-CQDs for possible and cost-effective applications in quantum dot-based optical displays and down-conversion green emissive light-emitting diodes.