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.