At Nexdot, we manufacture colloidal semiconductor nanoparticles with a fine control of their composition and of their shape. We lead top-level research on the optical and electronic properties of our nanoparticles and on their surface chemistry.

We develop the applications of Quantum Dots and Nanoplatelets in various fields such as displays, lighting, photodetectors, energy storage and fluorescent markers for diagnostic and biology purposes.

We are always eager to meet new challenges. Understanding the needs of our prospective partners, answering specific requirements from our clients and building close relationships on high technology service and product development are part of our objectives.

For more information on what can be done with Quantum Dots and Nanoplatelets technologies, please contact info@nexdot.fr


Nexdot is the pioneer in the synthesis of 2D colloidal semiconductor nanoparticles. We can synthesize and produce atomically flat Nanoplatelets with controlled lateral dimensions. We have acquired comprehensive know-how on 2D hetero-structures Nanoplatelets with very high fluorescence quantum yields and excellent stability in time.

We have also developed multi-shell spherical Quantum Dots to preserve their fluorescence properties even when their surface chemistry is modified. The modification of the Quantum Dot surface chemistry is one of our key technologies to take full advantage of their properties in industrial applications.

Synthesis of 2D atomically flat Nanoplatelets

We are the first company in the world that synthesizes semiconductor nanoparticles that are two dimensional and atomically flat. Structurally, these nanoparticles have unique optical and electronic properties; they are fluorescent with a color purity that cannot be matched by other phosphors or fluorophores and only depends on their thickness. Since this key parameter is controlled with atomic precision, the color purity reaches its fundamental limits: the fluctuations related to temperature. The emission of Nanoplatelets is also polarized and directional.

They are excellent building blocks for various applications using semiconductors as active materials. The Nanoplatelets we produce at Nexdot are, in some respects, the next generation of semiconductor nanocrystals.

Synthesis of spherical Quantum Dots

At Nexdot, we have developed Quantum Dots emitting in the visible to the near-Infrared range but most importantly with a fluorescence that remains robust even when their surface chemistry is exchanged to make them water soluble, or compatible with a polymer matrix. These Quantum Dots are excellent building blocks to produce more complex fluorescent architectures or Quantum Dot-based hybrid materials.

Quantum Dots semiconductor nanoparticles whether spherical or with a 2D shape have unique optical and electronic properties. When smartly assembled, these nanoparticles can become the building blocks of efficient cost-competitive devices for light production or energy storage/transformation. With Quantum Dot technology, we take a bottom-up approach to assemble components instead of a top-down strategy from bulk material.

Cost-disruptive photodetectors

Quantum Dots and Nanoplatelets have unique absorption signature that are directly related to the size and the composition of the nanocrystal. We use selected population of Quantum Dots and Nanoplatelets to assemble photo-detectors with a tunable band edge energy from ultraviolet to the mid-infrared.

Quantum Dots can be synthesized in a rather simple environment and can be deposited on a wide variety of wafers. They open new cost-disruptive opportunities for an industry with traditionnal high production costs.

Energy storage applications

Ion gel gating
Nanoparticles have much higher surface to volume ratio than most materials used in energy storage. We leverage this advantage to develop a new generation of nanoparticle-based supercapacitors. It requires both a smooth control of the surface chemistry of the nanoparticles and of their assembly as a homogeneous film.

We are working on achieving both objectives with an innovative ligand exchange method to reduce the gaps between Quantum Dots and facilitate the mobility of ions throughout the film. This advanced research field has recently been prized by the French government.

Quantum Dots and Nanoplatelets have optical properties that are extremely interesting for bio-imaging and for diagnostic applications. They are very bright and extremely resistant to photo-bleaching, so that a single nanoparticle can be visualized with a standard fluorescent microscope for hours. A single Ultraviolet excitation source is necessary to excite each sample of Quantum Dots that will emit a very pure size-dependent color in the visible or the near-infrared range.

These properties open up virtually unlimited possibility for the detection and the tracking of macromolecules of biological interest, down to single events.

A novel alternative to traditional fluorophores

In spite of these extremely interesting optical properties, water soluble Quantum Dots have not been widely used so far. This restricted use is mainly due to the sub-optimal properties of the surface chemistry of the Quantum Dotss developed so far that did not warrant their easy use as fluorescent marker for biological applications.

At Nexdot, we have developed new proprietary technologies based on an innovative surface chemistry that fulfills the following requirements: bright and stable particles in time, small size, low non-specific adsorption, easy coupling to macromolecules.

This next generation of water soluble Quantum-Dots and Nanoplatelets can be easily functionalized with targeting molecules including proteins, anti-bodies, DNA or RNA etc…