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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Updated: Jul 12, 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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Dye-Derived Red-Emitting Carbon Dots for Lasing and Solid-State Lighting.

Antonino Madonia¹, Gianluca Minervini^1,2, Angela Terracina³

¹CNR-IPCF Bari Division, Italian National Research Council, Bari, 70126, Italy.

|October 23, 2023

Summary

This summary is machine-generated.

We developed highly efficient red-emitting carbon dots using Neutral Red dye. These carbon dots offer enhanced photostability and enable solid-state applications, including lasing, overcoming limitations of traditional methods.

Keywords:

carbon dots color converters fluorescent nanoparticles laser random lasing solvothermal synthesis

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Published on: March 8, 2017

Area of Science:

Nanotechnology
Materials Science
Photochemistry

Background:

Carbon dots are valued for tunable light emission across the visible spectrum.
Efficient red-emitting carbon dots are crucial for biological imaging and optoelectronics.
Existing red-emitting carbon dots often suffer from low efficiency and poor optical control due to molecular domain formation.

Purpose of the Study:

To synthesize highly efficient red-emitting carbon dots.
To overcome the limitations of low quantum yield and poor optical control in red-emitting carbon dots.
To explore the potential of these novel carbon dots in solid-state applications and lasing.

Main Methods:

Solvothermal synthesis using Neutral Red dye as a molecular precursor.
Incorporation of Neutral Red into a carbonaceous core.
Fabrication of polymer-based, highly concentrated solid-state carbon dot nanocomposites.

Main Results:

Synthesized highly luminescent red-emitting carbon dots with quantum yields comparable to the precursor dye.
Demonstrated enhanced photostability and prevention of aggregation-induced quenching.
Achieved stable Fabry-Perot and efficient random lasing emission in the red region.

Conclusions:

Neutral Red-based carbon dots offer a viable route to efficient, stable red emission.
The carbonaceous matrix effectively protects the dye, enabling solid-state applications.
These carbon dots show promise for advanced optoelectronic devices and color conversion layers.