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Light Emitting Materials

Light Emitting Materials

Quantum Dots are composed of semiconductor materials such as cadmium selenide and indium phosphide, and can be constrained to nanoparticulate dimensions to achieve high fluorescence ( i.e. gain the capacity to absorb external light and re-emit it at a different frequency). This makes quantum dots ideal for applications such as photovoltaic devices, light emitting diodes (LEDs) and photocatalysts.

The surface of quantum dots can be functionalized with complex biological molecules (antibodies or enzymes), making these fluorescent compounds ideal for biomedical applications such as in vivo imaging, flow cytometry, cell staining and western blotting.

Quantum Dot performance factors

The adsorbed and emitted frequencies of light are dependent on the size, shape and architecture of these particles. The emission profiles of the quantum dots can therefore be tuned by chemical manipulation:

  • Increase in particle size will increase the emission wavelength
  • Introducing shape anisotropy (e.g. by fabricating nanorods) will result in additional emission peaks
  • Changing the composition of the underlying material will alter the emission peak (e.g. In case of cadmium selenide, increasing the proportion of Se will increase the wavelength of the emission)
  • Introducing a secondary shell of semiconductor material around the quantum dot (e.g. fabrication of CdSe-ZnS core-shell particles) tends to increase the luminescence of the material

Precision fabrication is therefore the key to achieving high performance quantum dots.

Benefits of Particle Works quantum dots

Typically, nanoparticle suppliers provide non-uniform or polydisperse (CV values >20%) quantum dots in which particles have a range of sizes, shapes and architectures. As a result their emission spectra tends to be broad and benign.

Particle Works offers a range of highly monodisperse (CV values <2.5%) quantum dots with narrow emission profiles. These high-performance materials bring benefits such as:

  1. High luminescence
  2. High signal-to-noise ratio
  3. Experimental reproducibility

Products

The following nanoparticles in the Particle Works range are suitable for applications such as light emitting materials:  

CdSe Quantum Dots When processing in organic solvents, we recommend CdSe quantum dots in toluene
  When fluorescent contrast agents are required, we recommend encapsulated CdSe quantum dots (available on request only)