USA As Represented by Secretary of the Navy

Alexander L Efros

Michael Shur

Alan L Huston

Igor L Medintz

Jeffrey R Deschamps

James B Delehanty

Kimihiro Susumu

Philip E Dawson

Michael H Stewart

Eunkeu Oh

Okhil Nag

Lauren D Field

Boris N Feigelson

Benjamin L Greenberg

Parag Chitnis

George E Cragg

Emmanuel Rashba

Mervine Rosen

Nashaat Rasheed

John R Cressman

A bipolar nanocomposite semiconductor (BNS) material in which electrons and holes are separately transported throughout the BNS volume via an interpenetrating plurality of networks, where some of the networks have one conductivity type and others have the opposite conductivity type. The interpenetrating networks can include one or more multiple nanocrystalline structures, metal and dielectric networks and are intimately connected to enable band-like transport of both electrons and holes throughout the material.

Bipolar nanocomposite semiconductors

An optoelectronic device comprising at least one quantum well (QW) and at least one quantum dot (QD) incorporated in the quantum well with the band gap of the quantum well being larger than the band gap of the quantum dot. The QDs and QD arrays are embedded in various QW, thus providing higher yields in optoelectronic devices, such as light emitting diodes, lasers, and photodetectors. This is achieved by a nearly complete suppression of the nonradiative Auger recombination and enhancement of the light extraction efficiency.

QW-QWD LED with suppressed auger recombination

A construct for detecting cellular membrane potential includes a nanoparticle operable as an electron donor; a modular peptide attached to the nanoparticle, the peptide comprising a nanoparticle association domain, a motif configured to mediate peptide insertion into the plasma membrane, and at least one attachment point for an electron acceptor positioned at a controlled distance from the nanoparticle; and an electron acceptor. The nanoparticle can be a quantum dot and the electron acceptor can be Cfullerene. Emission correlates with cellular membrane potential.

Modular, multifunctional nanoparticle-based bioconjugate for realtime visualization of cellular membrane potential

A construct for detecting cellular membrane potential includes a nanoparticle operable as an electron donor; a modular peptide attached to the nanoparticle, the peptide comprising a nanoparticle association domain, a motif configured to mediate peptide insertion into the plasma membrane, and at least one attachment point for an electron acceptor positioned at a controlled distance from the nanoparticle; and an electron acceptor. The nanoparticle can be a quantum dot and the electron acceptor can be Cfullerene. Photoacoustic emission from the construct correlates with cellular membrane potential.

Multifunctional nanoparticle bioconjugates for photoacoustic-based recording of cellular membrane potential

The present invention is generally directed to a method of suppressing the Auger rate in confined structures, comprising replacing an abrupt confinement potential with either a smooth confinement potential or a confinement potential of a certain size found by increasing the confinement potential width until the Auger recombination rate undergoes strong oscillations and establishes a periodic minima. In addition, the present invention provides for the design of structures with high quantum efficiency.

Auger rate suppression in confined structures

This invention pertains to a device and a method for injecting spin polarized monochromatic electrons with a particular magnetic moment at room temperature and in absence of an external magnetic field into a nonmagnetic electrode. The device comprises a ferromagnetic electrode, a nonmagnetic electrode spaced from the ferromagnetic electrode, a nanocrystal doped with a single active paramagnetic ion disposed in the space between the electrodes, and an electrical connection between the electrodes for applying voltage to move the electrons from the ferromagnetic electrode, through the doped nanocrstal and into the nonmagnetic electrode. The method comprising the step of applying voltage between spaced ferromagnetic and nonmagnetic electrodes whereby spin polarized electrons are passed from the ferromagnetic electrode through a doped nanocrystal that is spaced from the ferromagnetic electrode and is in contact with the nonmagnetic electrode, and into the nonmagnetic electrode, the nanocrystal being doped with a single paramagnetic ion.

Voltage controlled nonlinear spin filter based on paramagnetic ion doped nanocrystal

Growing community of inventors

Annandale, VA, United States of America

Alexander L Efros