Colloidal nanocrystal ensembles with narrow linewidth band gap photoluminescence and methods of synthesizing colloidal semiconductor nanocrystals
US8932489B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2009 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Sep 1, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/48
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of synthesizing colloidal semiconductor nanocrystals involves contacting a source of at least one semi-conductor cation element (Group 11-14, more preferably Group 12-14, more preferably 12 or 14, more preferably Cd, Zn, Hg or Pb, most preferably Cd) with a source of at least one Group 15, or 16 element in the presence of a ligand forming compound containing a carboxylic acid moiety in a reaction medium comprising a solvent that is substantially noncoordinating with respect to the at least one cation, the ligand forming compound and the source of at least one cation element having a molar ratio of 1:1 or less. The cation element source is preferably bonded to two low carbon acids. Some of the low carbon acids are substituted with the ligand forming compound to produce a cation precursor that is more soluble in the noncoordinating solvent. The method produces novel ensembles of colloidal semiconductor nanocrystals that have narrow linewidth absorption and bandgap photoluminescence spectra indicating that the colloidal semiconductor nanocrystals are of substantially a single size. The single size families are produced for CdSe, CdTe, CdS, CdSeTe, and CdP.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.