Highly luminescent color-selective nanocrystalline materials

Patent metadata

Field	Value
Publication number	US-9790424-B2
Application number	US-201514682070-A
Country	US
Kind code	B2
Filing date	Apr 8, 2015
Priority date	Nov 13, 1997
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A nanocrystal capable of light emission includes a nanoparticle having photoluminescence having quantum yields of greater than 30%.

First claim

What is claimed is:

1. A monodisperse population of nanocrystals comprising:
a plurality of nanocrystal particles, wherein each particle includes a core including a first semiconductor material and an overcoating including a second semiconductor material deposited on the core;
wherein the first semiconductor material and the second semiconductor material are different;
wherein the monodisperse population emits light in a spectral range of no greater than about 37 nm full width at half max (FWHM);
wherein the overcoating is a crystalline overcoating; and
wherein the monodisperse population exhibits photoluminescence having a quantum yield of greater than 30%.

2. A coated nanocrystal capable of light emission, comprising:
a core comprising a first semiconductor material, said core being a member of a monodisperse particle population; and
an overcoating uniformly deposited on the core comprising a second semiconductor material,
wherein the first semiconductor material and the second semiconductor material are different,
wherein the monodisperse particle population is characterized in that it exhibits no more than about 10% rms deviation in the diameter of the core, and
and wherein the monodisperse particle population is characterized in that when irradiated the population emits light in a spectral range of no greater than about 37 nm full width at half max (FWHM) and the coated nanocrystal exhibits photoluminescence having quantum yields in the range of at least 30%.

3. The coated nanocrystal of claim 2 , wherein the spectral range is not greater than about 30 nm full width at half max (FWHM).

4. The coated nanocrystal of claim 2 , wherein the coated nanocrystal exhibits photoluminescence having quantum yields in the range of about 30% to 50%.

5. The coated nanocrystal of claim 2 , wherein the spectral range is selected from the spectrum in the range of about 470 nm to about 620 nm.

6. The coated nanocrystal of claim 2 , wherein the monodisperse particle population is characterized in that it exhibits no more than about 5% rms deviation in the diameter of the core.

7. The coated nanocrystal of claim 2 , wherein the diameter of the core is in the range of about 20 Å to about 125 Å.

Assignees

• Massachusetts Inst Technology

Inventors

• Bawendi Moungi G
• Jensen Klavs F
• Dabbousi Bashir O
• Rodriguez-Viejo Javier
• Mikulec Frederic Victor

Classifications

• C09K11/02

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• Y10S977/824

  Group II-VI nonoxide compounds, e.g. CdxMnyTe · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C30B29/48

  AIIBVI compounds {wherein A is Zn, Cd or Hg, and B is S, Se or Te} · CPC title