Samsung Electronics Co., Ltd.

Massachusetts Institute of Technology

Qd Vision, Inc.

Wenhao Liu

Craig Allen Breen

Moungi G Bawendi

Peter Matthew Allen

Seth A Coe-Sullivan

Hee-Sun Han

Daniel G Nocera

Mark Howarth

Annie Cho Won

Zhiming Wang

Peter M Allen

Andrew B Greytak

Numpon Insin

Alice Ting

A coated quantum dot is provided wherein the quantum dot is characterized by having a solid state photoluminescence external quantum efficiency at a temperature of 90&#xb0; C. or above that is at least 95% of the solid state photoluminescence external quantum efficiency of the semiconductor nanocrystal at 25&#xb0; C. Products including quantum dots described herein are also disclosed.

Coated semiconductor nanocrystals and products including same

A semiconductor nanocrystal characterized by having a solid state photoluminescence external quantum efficiency at a temperature of 90&#xb0; C. or above that is at least 95% of the solid state photoluminescence external quantum efficiency of the semiconductor nanocrystal at 25&#xb0; C. is disclosed. A semiconductor nanocrystal having a multiple LO phonon assisted charge thermal escape activation energy of at least 0.5 eV is also disclosed. A semiconductor nanocrystal capable of emitting light with a maximum peak emission at a wavelength in a range from 590 nm to 650 nm characterized by an absorption spectrum, wherein the absorption ratio of OD at 325 nm to OD at 450 nm is greater than 5.5. A semiconductor nanocrystal capable of emitting light with a maximum peak emission at a wavelength in a range from 545 nm to 590 nm characterized by an absorption spectrum, wherein the absorption ratio of OD at 325 nm to OD at 450 nm is greater than 7. A semiconductor nanocrystal capable of emitting light with a maximum peak emission at a wavelength in a range from 495 nm to 545 nm characterized by an absorption spectrum, wherein the absorption ratio of OD at 325 nm to OD at 450 nm is greater than 10. A composition comprising a plurality of semiconductor nanocrystals wherein the solid state photoluminescence efficiency of the composition at a temperature of 90&#xb0; C. or above is at least 95% of the solid state photoluminescence efficiency of the composition 25&#xb0; C. is further disclosed. A method for preparing semiconductor nanocrystals comprises introducing one or more first shell chalcogenide precursors and one or more first shell metal precursors to a reaction mixture including semiconductor nanocrystal cores, wherein the first shell chalcogenide precursors are added in an amount greater than the first shell metal precursors by a factor of at least about 2 molar equivalents and reacting the first shell precursors at a first reaction temperature of at least 300&#xb0; C. to form a first shell on the semiconductor nanocrystal cores. Populations, compositions, components and other products including semiconductor nanocrystals of the invention are disclosed. Populations, compositions, components and other products including semiconductor nanocrystals made in accordance with any method of the invention is also disclosed.

Semiconductor nanocrystals, methods for making same, compositions, and products

In this invention, polyimidazole ligands (PILs) incorporating pendant imidazole moieties for nanocrystal binding and either sulfonatebetaine, carboxybetaine, or phosphocholinebetaine moieties for water-solubilization have been developed. Greatly enhanced stability of nanocrystals (both over time and in wide pH range) was achieved by incorporating multi-dentate imidazole moieties which provide strong coordination of the ligand to the nanocrystal surface and prevent aggregation of nanocrystals. Synthesis of betaine PILs was developed by modifying the synthesis of recently developed PEG containing poly imidazole ligands (PEG PILs). These nanocrystals are compact, water soluble, and biocompatible.

Ligands for semiconductor nanocrystals

A semiconductor nanocrystal can have a photoluminescent quantum yield of at least 90%, at least 95%, or at least 98%. The nanocrystal can be made by sequentially contacting a nanocrystal core with an M-containing compound and an X donor, where at least one of the M-containing compound and the X donor is substoichiometric with respect to forming a monolayer on the nanocrystal core.

Highly luminescent semiconductor nanocrystals

A coated quantum dot and methods of making coated quantum dots are provided.

Methods for coating semiconductor nanocrystals

Quantum dots and methods of making quantum dots are provided.

Method of making quantum dots

A semiconductor nanocrystal that emits green light having a peak emission with a full width at half maximum of about 30 nm or less at 100&#xb0; C. and a method of making coated semiconductor nanocrystals are provided. Materials and other products including semiconductor nanocrystals described herein and materials and other products including semiconductor nanocrystals prepared by a method described herein are also disclosed.

Semiconductor nanocrystals, method for coating semiconductor nanocrystals, and products including same

Semiconductor nanocrystals, a method for coating semiconductor nanocrystals, and products including same

A method for making semiconductor nanocrystals is disclosed, the method comprising adding a secondary phosphine chalcogenide to a solution including a metal source and a liquid medium at a reaction temperature to form a reaction product comprising a semiconductor comprising a metal and a chalcogen, and quenching the reaction mixture to form quantum dots. Methods for overcoating are also disclosed. Semiconductor nanocrystals are also disclosed.

Method for preparing semiconductor nanocrystals

Water soluble InAs(ZnCdS) semiconductor nanocrystals with bright and stable emission in the near infrared (NIR) wavelength range have been prepared. The NIR semiconductor nanocrystals can be functionalized to enable imaging of specific cellular proteins. In addition, the utility of the NIR region for in vivo biological imaging is clearly demonstrated by the superior ability of InAs(ZnCdS) semiconductor nanocrystals to image tumor vasculature.

Materials and methods for biological imaging

A nanomaterial can include an outer layer including a ligand. The ligand can include a first monomer unit including a first moiety having affinity for a surface of the nanocrystal, a second monomer unit including a second moiety having a high water solubility, and a third monomer unit including a third moiety having a selectively reactive functional group or a selectively binding functional group. The ligand can be a random copolymer.

Growing community of inventors

Billerica, MA, United States of America

Wenhao Liu