Graphene Quantum Dots Powder – Red Fluorescence | Ridgehart High-Purity GQDs for Composites and Optoelectronics

Ridgehart™ Red-Emitting Graphene Quantum Dots (GQDs) are advanced carbon nanomaterials engineered for optical, electronic, and composite applications. These ultra-small (<10 nm), brownish-black graphene nanodots exhibit strong red fluorescence (emission ≈641 nm) when excited around 560 nm. Functionalized with –COOH, –OH, and –NH₂ surface groups, they provide excellent dispersibility, tunable optical performance, and high chemical stability for use in composite materials, coatings, and optoelectronic devices.

• Ultra-Small Particle Size (< 10 nm): Ensures uniform dispersion, quantum confinement, and high photoluminescence stability.
• Solvents: DMF, DMSO, EG
• Fluorescence Colour: Red
• Excitation / Emission Wavelengths: 560 nm / ≈ 641 nm
• Surface Functional Groups: –COOH, –OH, –NH₂
• Appearance: Brownish-black powder
• Purity: ≥ 99 %
• Thermal Stability: Stable up to ~200 °C (TGA verified)

Key Features:

• Functionalised Surface: Hydroxyl, amino, and carboxyl groups improve chemical reactivity, dispersion, and bonding with polymers and composites.
• Red Fluorescence Emission: Bright, stable red luminescence under 560 nm excitation—ideal for red-emitting materials and optical tagging.
• High Solvent Compatibility: Easily dispersible in DMF, DMSO, and ethylene glycol for solution or coating preparation.
• Thermally and Chemically Stable: Maintains structure and fluorescence under diverse synthesis or processing conditions.
• Environmentally Friendly Composition: Metal-free, carbon-based nanomaterial offering safer handling than heavy-metal QDs.
• Excitation-Dependent Fluorescence: Emission can shift with excitation wavelength, enabling colour-tunable optical design.

Advantages:

• High chemical and thermal stability suitable for polymer processing.
• Uniform size distribution ensures reproducible optical performance.
• Excitation-dependent fluorescence enables wavelength tuning.
• Compatible with polymers, epoxy resins, and conductive films.
• Low cytotoxicity; safe for lab-scale optoelectronic studies.

Storage Conditions:

Store in a dry, dark environment at 4 °C, sealed tightly to prevent moisture exposure. For dispersions, sonicate at 700 W for 30 minutes in DMF, DMSO, or EG immediately before use. Recommended shelf life: 6 months under proper storage once unsealed.

Application Uses:

Composite Materials: Enhances electrical conductivity, fluorescence, and mechanical strength in epoxy, polymer, or hybrid composites.
Coatings: Used in luminescent and anti-corrosion coatings; adds red fluorescence and photo-resistance.
Optoelectronic Devices: Suitable for LEDs, photodetectors, solar cells, and display technologies requiring red emission.
Fluorescent Probes & Sensors: For red-region fluorescence imaging, pH or ion detection, and anti-counterfeiting inks.
Energy Storage: As an additive for conductive enhancement in electrodes or supercapacitors.
Photocatalysis & Electrocatalysis: Facilitates visible-light reactions for pollutant degradation and CO₂ reduction.
Surface Functionalisation Studies: Model system for molecular attachment, charge transfer, and surface energy research.
Research & Development: Ideal for photonic, composite, and nanomaterial innovation studies.

Many more application uses — please enquire for custom formulations or dispersion options.