Premium Grade Quantum Dots

Navillum Nanotechnologies (Navillum) manufactures semiconductor quantum dots (QDs) using our patented, novel manufacturing synthesis that yields consistently high quality QDs which meet the full rec.2020 color gamut required for the display quality required for the next generation of high definition displays. (Figure 1) Rec.2020 is the International Telecommunication Union (ITU) Recommendation BT.2020 (rec.2020). ITU is one of several organizations that sets the standards upon which the production, broadcast, and display industries rely to ensure that produced content is being accurately transmitted and faithfully displayed. Navillum’s will work with you to develop QDs that meet your exacting performance specifications for your next generation display products.

Figure 1. Rec.2020 is a new color standard for UHD TV that will be implemented in a three-phase roadmap that has the standard fully implemented by the year 2020.

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Figure 2. Effect of emitter spectral emission on bandwidth (Full Width Half Maximum, FWHM) on the color gamut; narrower FWHM means better display color.

Navillum’s QD synthesis process is a thermodynamically driven, low temperature method of producing consistent, high quality QDs that eliminates the current limitations of the high temperature synthesis methods. The Navillum synthesis relies, on a thermodynamic-equilibrium between nanoparticle growth and nanoparticle dissolution processes, which provides us with a high degree of control over net QD growth, and formation.

The advantage of producing QDs at close to absolute thermodynamic equilibrium is that it results in the formation of particularly high-quality QD crystals characterized by minimal defects such as inclusions, occlusions, distortions and faults. It also facilitates maximum control of net crystal growth rate and tight, crystal-size distribution. These characteristics translate into highly desirable, narrow-bandwidth emission (low PL-FWHM), as shown in (Figure 2), and bright photoluminescent QDs whose colors are pure and vivid.

Figure 3. Navillum’s QDs produce pure and vivid color with superior performance to current QD products.

Navillum QDs have superior quality and performance characteristics:

  • Narrow size distributions
  • Bright Photoluminescence
  • Tuneable photoluminescence peak-center wavelengths at the edge or range
  • Narrow photoluminescence peaks
  • Symmetrical emission peaks with no skew, leptokurtosis i.e., “fat tails”

Typical Product Specifications

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Cadmium-Free

Existing production methods, both CdSe and Cadmium free QDs (such as Indium Phosphide, InP), suffer from broad PL-FWHM due to poor control of FWHM size distribution either as a result of poorly controlled or difficult to scale production methods. Recently reported values for Cadmium free QDs, range from 41nm for green and 64nm for red; which are unacceptably high for most display standards.

The advantages of the Navillum QD synthesis process are well established, and we have extensive experience utilizing the process for the production of high-quality cadmium selenide core/zinc sulfide shell QDs. We have also utilized the process to synthesize quantum dots with alternative, Group VI elements (i.e., calcogenides), including sulphur and tellurium, and with the Group II element, zinc.

Navillum is prepared to expand the scope of its unique synthesis process to encompass additional semiconductor materials, particularly those that are cadmium-free. We are confident that the colloidal chemistry that has produced our outstanding QDs to date will transfer successfully to new materials such as indium phosphide, copper indium phosphide and manganese-doped semiconductors.

Appropriate, chemically-analogous selections of elemental precursors, surfactants, ligands and a common solvent will be critical to this transfer; and we are currently researching these choices. Optimal ratios for the identified, new constituents will also have to be evaluated. We are pursuing cadmium-free QD production possibilities as quickly as existing resources permit; the potential for achieving a non-toxic, environmentally benign QD product is excitingly high.

IN DEVELOPMENT:
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