Simple Large-Scale Preparation of Carbon Dot Composites with High Luminescent Performance

Area of Science:

• Materials Science
• Nanotechnology
• Photochemistry

Background:

• Growing demand for high-performance, cost-effective luminescent materials.
• Carbon dots (CDs) offer unique advantages but face commercialization challenges due to complex preparation and purification.
• Existing issues include fluorescence quenching, low short-wavelength quantum yield, and short phosphorescence lifetimes.

Purpose of the Study:

• To develop a scalable and cost-effective method for preparing carbon dot composites.
• To enhance the luminescent properties of carbon dots for applications in deep-blue LEDs and phosphorescent encryption.
• To address limitations of current carbon dot preparation and performance.

Main Methods:

• Large-scale preparation of carbon dot composites using easy, controllable, and repeatable strategies.
• Characterization of the composites' luminescent properties, including fluorescence quantum yield and phosphorescence lifetime.
• Analysis of the influence of ammonia, polar groups, and urea content on the matrix crystallization process.

Main Results:

• Achieved a fluorescence quantum yield of 65.46% and a phosphorescence lifetime of 1489.2 ms.
• Demonstrated that ammonia, polar groups, and urea content impact matrix crystallization.
• Identified surface free energy as a factor influencing composite morphology and structure.

Conclusions:

• Successfully prepared scalable carbon dot composites with excellent luminescent performance.
• The study provides insights into the reaction process between CDs and the matrix, driven by surface free energy.
• The demonstrated scale-up potential inspires future large-scale production of solid carbon dots for advanced applications.