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Updated: Oct 5, 2025

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Solution-processable carbon dots with efficient solid-state red/near-infrared emission.

Yanfei Qu¹, Xuewei Bai¹, Di Li¹

¹Key Laboratory of Automobile Materials, College of Materials Science and Engineering, Jilin University, Changchun 130012, PR China.

Journal of Colloid and Interface Science

|January 22, 2022

Summary

This summary is machine-generated.

Chemically functionalizing carbon dots (CDs) with branched-polyethylenimine (b-PEI) overcomes aggregation-caused quenching, enabling efficient solid-state red and near-infrared emission for optoelectronics.

Keywords:

Aggregation-induced luminescence quenching Carbon dot Red/near-infrared luminescence Solid-state luminescence Solution process

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Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Carbon dots (CDs) offer low cost, eco-friendly, and tunable photoluminescence (PL).
Solid-state applications of CDs are limited by aggregation-caused quenching (ACQ) and poor film formation.
Overcoming ACQ is crucial for developing efficient solid-state emissive materials.

Purpose of the Study:

To synthesize surface-functionalized carbon dots (P-CDs) that overcome ACQ.
To achieve efficient red and near-infrared (NIR) emission in the solid state.
To enhance film-formation ability for optoelectronic device applications.

Main Methods:

Chemical functionalization of carbon dots with branched-polyethylenimine (b-PEI).
Characterization of photoluminescence (PL) properties, including PL quantum yield (PLQY).
Evaluation of film-formation ability using solution spin-coating.

Main Results:

Synthesized P-CDs exhibit efficient red emission (maxima 640 nm) with a high PLQY of 21% in neat films.
P-CDs demonstrate suppressed aggregation-caused quenching (ACQ) in the aggregate state.
The P-CDs show good film-formation capability via solution spin-coating.

Conclusions:

Surface functionalization of CDs with b-PEI effectively mitigates ACQ.
The developed P-CDs are promising for solid-state optoelectronic applications due to efficient red/NIR emission and good film-forming properties.
This strategy enhances the utility of CDs in film-based devices.