Full-Color Emission Polymer Carbon Dots with Quench-Resistant Solid-State Fluorescence

Area of Science:

• Materials Science
• Nanotechnology
• Photochemistry

Background:

• Polymer carbon dots (PCDs) offer unique polymer-like structures but face self-quenching in solid states, limiting applications.
• Achieving full-color emission from a single type of PCD by concentration modulation is challenging.

Purpose of the Study:

• To develop self-quenching-resistant solid-state fluorescent polymer carbon dots (SSFPCDs).
• To enable full-color emission from a single chemical structure of SSFPCDs by varying concentration ratios.
• To overcome the limitations of traditional carbon dots and small molecule dyes in solid-state applications.

Main Methods:

• Synthesis of self-quenching-resistant solid-state fluorescent polymer carbon dots (SSFPCDs).
• Characterization of SSFPCDs' photophysical properties, including solid-state fluorescence and quantum yield.
• Dispersion of SSFPCDs in water and solid matrices at gradient concentrations to observe emission color changes.

Main Results:

• SSFPCDs exhibit strong red solid-state fluorescence (SSF) with a high production yield (≈89%) and quantum yield (8.50%).
• SSFPCDs demonstrate tunable full-color emission (yellow, green, blue) by changing their concentration ratio in different matrices.
• This represents the first instance of SSFPCDs with a single chemical structure achieving full-color emission through concentration adjustment.

Conclusions:

• The developed SSFPCDs effectively resist self-quenching in the solid state.
• SSFPCDs provide a versatile platform for full-color emission applications by simple concentration control.
• This breakthrough expands the potential applications of polymer carbon dots in solid-state optoelectronics and sensing.