Quantum Dots in Toluene

What it means: Quantum Dots (QDs) are semiconductor nanocrystals (typically 2–10 nm core diameter) whose optical emission wavelength is determined by particle size — smaller dots emit at shorter (bluer) wavelengths, larger dots at longer (redder) wavelengths. This "size-tunable" emission is a unique property not shared by organic fluorophores.

Why it matters:

• Far superior photostability compared to organic dyes — enabling long time-lapse imaging and repetitive scanning.
• Narrow emission peaks (FWHM < 35 nm) reduce spectral crosstalk in multiplexed detection panels.
• Multiple QD colors can be excited simultaneously from a single UV or blue light source.
• High molar extinction coefficient gives bright signal per molecule.

How to interpret here: This product is a Quantum Dot format. The emission wavelength value shown is the peak output wavelength — select it to match your detector filter/laser combination. All wavelengths can be excited together for multiplexed assay panels.

Tip: QDs are larger than organic dye molecules (~10–20 nm total diameter with coating). This may affect steric accessibility in some applications — test at pilot scale before full assay build-out.

What it means: Emission Wavelength is the peak fluorescence output of the quantum dot. Available wavelengths: 400 nm–645 nm.

Why it matters:

• Each wavelength corresponds to a specific detector filter/laser channel in your instrument.
• Multiple QD wavelengths can be detected simultaneously with a single UV or blue excitation source — enabling multiplexed panels.
• All wavelengths from 400 nm–645 nm are available as individual products and as a combo pack.
• Narrow emission peaks (FWHM < 35 nm) minimize spectral crosstalk between detection channels.

How to interpret here: Select the emission wavelength that matches your available detector filter set. For multiplex assays, select one wavelength per detection channel. The full range 400 nm–645 nm can be combined in the same experiment with a single excitation source.

Tip: Always verify the exact filter transmittance of your instrument to confirm the selected wavelength is centered within the bandpass. A slight mismatch can reduce signal intensity significantly.

What it means: Toluene dispersion means this product is supplied in toluene — a flammable organic solvent. Organic QDs in toluene are designed for optoelectronic and materials science applications, not biological assays.

Why it matters:

• Toluene provides a stable medium for hydrophobic QD cores coated with oleic acid/oleylamine ligands.
• Optoelectronic device applications (QD-LEDs, solar cells) use QDs in organic solvent formats.
• Quantum yield >50% in toluene is optimized for optoelectronics — not the same as in aqueous biological buffers.
• For biological/aqueous use, QDs require ligand exchange to water-soluble coatings.

How to interpret here: This product is dispersed in Toluene. It is designed for optoelectronic and materials science applications. For biological detection, imaging, or immunoassay applications, use the water-soluble quantum dot series (Carboxyl, Amine, PEG, or Streptavidin QDs).

Tip: Toluene is flammable and harmful by inhalation. Always handle in a fume hood with appropriate PPE. Refer to the SDS in the Documents section.

What it means: Applications list the primary experimental workflows this product has been used for: Immunoassay, Multiplexing, Tissue Imaging, Flow Cytometry.

Why it matters:

• Immunoassay: this product can directly support this workflow based on its surface chemistry and particle properties.
• Multiplexing: this product can directly support this workflow based on its surface chemistry and particle properties.
• Tissue Imaging: this product can directly support this workflow based on its surface chemistry and particle properties.

How to interpret here: This product is suited for the listed applications. The most relevant for this product are Immunoassay, Multiplexing. Review the application-specific protocol in the Documents section before beginning workflow development.

Tip: Application suitability depends on specific experimental conditions (buffer, sample matrix, target concentration). Always validate at pilot scale before full assay development.