Research on the Microwave Hydrothermal Synthesis of Water Hyacinth-Based CDs and Their Potential Application in LEDs

Biomass is widely used for the synthesis of high-performance carbon dots (CDs) because of its environmentally friendly and recyclable properties. In this study, long-wavelength luminescent CDs were synthesized by a green and simple microwave hydrothermal method using water hyacinth as a carbon source. The fluorescence emission of CDs will be significantly red-shifted to 678 nm after the introduction of dimethylformamide (DMF). It was demonstrated that the red light of CDs is caused by the increase of sp 2 conjugated structural domains and graphite N. The fluorescence emission of long-wavelength luminescent CDs is significantly shifted to 678[Formula: see text]nm after the introduction of DMF. Subsequently, the resulting CDs were initially used in fluorescent films and light-emitting diodes (LEDs). This provides a new approach to utilizing water hyacinth resources and has the potential to integrate biomass CDs into light-emitting diodes on a large scale.