Highly luminescent color selective nanocrystalline materials

US6861155B2 · kind B2 · utility

Assignee

• Massachusetts Institute of Technology · US

Inventors

• Moungi G. Bawendi · Cambridge, US
• Klaus F. Jensen · Lexington, US
• Bashir O. Dabbousi · Dhahran, SA
• Javier Rodriguez-Viejo · Sant Cugat del Vallès, ES
• Frederic Victor Mikulec · Somerville, US

Key dates

• Filing date: Aug 19, 2003
• Grant date: Mar 1, 2005
• Expiry date: Aug 19, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A coated nanocrystal capable of light emission includes a substantially monodisperse nanoparticle selected from the group consisting of CdX, where x=S, Se, Te and an overcoating of ZnY, where Y=S, Se, uniformly deposited thereon, said coated nanoparticle characterized in that when irradiated the particles exhibit photoluminescence in a narrow spectral range of no greater than about 60 nm, and most preferably 40 nm, at full width half max (FWHM). The particle size of the nanocrystallite core is in the range of about 20 Å to about 125 Å, with a deviation of less than 10% in the core. The coated nanocrystal exhibits photoluminescence having quantum yields of greater than 30%.