Enhancing Luminescence of Carbon Nanodots in Films by Tailoring Functional Groups through Alkylamine-functionalization and Reduction
Enhancing the luminescence efficiency and stability of solid-state luminant with facile processability is important for various applications. Carbon-based materials might have proper optical features and durability under ambient condition. However, the carbon-based luminants usually showed severe quenching of the photoluminescence in the absence of solvent. Alkyl-chain functionalization of the carbon-based luminants can alleviate the quenching, but it also resulted in low luminous efficiency. In this study, tailoring the functional groups of carbon nanodots (CNDs) was carefully studied through alkyl chain-functionalization and reduction. The reduction with NaBH4 changed the electron-withdrawing functional groups on the alkyl chain-functionalized CNDs to the electron-donating groups, enhancing the luminescence efficiency. The delicate modulation in alkyl chain-functionalization and reduction enabled efficient and robust photoluminescence in the film without any host materials.