Alliance for Sustainable Energy, LLC

University of Colorado

Duke University

Trustees of the Colorado School of Mines

Matthew C Beard

Joseph Matthew Luther

Joseph Jonathan Berry

Haipeng Lu

Daniel McCray Kroupa

Young-Hoon Kim

Lance Michael Wheeler

Nicholas Charles Anderson

Jeffrey Lee Blackburn

Zeev Valentine Vardeny

Alan Sellinger

Nathan Richard Neale

Ji Hao

Chuanxiao Xiao

Annalise Elizabeth Maughan

David Brian Mitzi

Marissa Sally Martinez

Zhiyuan Huang

Yaxin Zhai

Asa W Nichols

Boris D Chernomordik

Ryan Crisp

Volker Wolfgang Blum

Octavi Escala Semonin

Barbara Katherine Hughes

Hsiang-Yu Chen

Described herein are spin polarized light emitting diodes (LEDs) and methods of making the same. Spin polarization is achieved via chiral induced spin selectivity where, for example, a stereochemically active cation is included in a perovskite to form the conductive layer of an LED device. Advantageously, the devices and methods described herein allow for spin polarization at room temperature and without application of a magnetic field or ferromagnetic contacts, in contrast to other described spin selective LEDs.

Chiral induced spin selectivity enabling a room temperature spin polarized light emitting diode

The present disclosure relates to a nanocrystal that includes a nanocrystal core, a first ligand coordinated to a first portion of a surface of the nanocrystal core, and a second ligand coordinated to a second portion of the surface, where the second ligand includes a first functionalized aromatic molecule.

Ligand-exchangeable janus nanoparticles and methods of making the same

The present disclosure relates to a composition that includes a first layer having a first molecule that includes a metal and a halogen, a second layer that includes the first molecule, and a third layer that includes a chiral molecule, where the third layer is positioned between the first layer and the second layer, and the first layer, the second layer, and the third layer form a crystalline structure.

Chiral heterostructures

The present disclosure relates to a composition that includes a nanocrystalline core that includes a perovskite and having an outer surface, and a chiral molecule having a functional group, where the functional group is bonded to a first portion of the outer surface, and the composition is capable of circularly polarized luminescence (CPL). In some embodiments of the present disclosure, the composition is capable of absorbing circularly-polarized light.

Compositions of chiral molecules and perovskite nanocrystals and methods of making the same

The present disclosure relates to a composition that includes a perovskite of ABX, where A includes an R-form of a chiral molecule of at least one of and/or an S-form of the chiral molecule, B includes a cation, X includes an anion, Rincludes a first carbon chain having between 2 and 5 carbon atoms, Rincludes at least one of a hydrogen atom, a halogen atom, a carboxylic acid group, an alkoxy group, and/or a second carbon chain, and Rincludes a third carbon chain.

Two-dimensional perovskite compositions and devices therefrom

The present disclosure relates to a composition that includes a first element, a second element, a third element, a ligand, and an anion, where the first element and the second element form a nanocrystal that includes a surface and a crystal lattice, a first portion of the third element covers at least a second portion of the surface in the form of a layer, a third portion of the third element is incorporated into the crystal lattice, and the ligand and the anion are ionically bound to at least one of the second element and/or the first portion of the third element.

Doped semiconductors and methods of making the same

An aspect of the present disclosure is a nanocrystal that includes a nanocrystal core and a ligand coordinated to a surface of the nanocrystal core, where the ligand includes a functionalized aromatic molecule. In some embodiments of the present disclosure, the functionalized aromatic molecule may include at least one of cinnamic acid (CAH) and/or a functionalized CAH molecule.

Ligand-exchangeable nanoparticles and methods of making the same

Methods are described that include reacting a starting nanocrystal that includes a starting nanocrystal core and a covalently bound surface species to create an ion-exchangeable (IE) nanocrystal that includes a surface charge and a first ion-exchangeable (IE) surface ligand ionically bound to the surface charge, where the starting nanocrystal core includes a group IV element.

Group IV nanocrystals with ion-exchangeable surface ligands and methods of making the same

Methods of treating nanocrystal and/or quantum dot devices are described. The methods include contacting the nanocrystals and/or quantum dots with a solution including metal ions and halogen ions, such that the solution displaces native ligands present on the surface of the nanocrystals and/or quantum dots via ligand exchange.

Metal halide solid-state surface treatment for nanocrystal materials

A method of forming an optoelectronic device. The method includes providing a deposition surface and contacting the deposition surface with a ligand exchange chemical and contacting the deposition surface with a quantum dot (QD) colloid. This initial process is repeated over one or more cycles to form an initial QD film on the deposition surface. The method further includes subsequently contacting the QD film with a secondary treatment chemical and optionally contacting the surface with additional QDs to form an enhanced QD layer exhibiting multiple exciton generation (MEG) upon absorption of high energy photons by the QD active layer. Devices having an enhanced QD active layer as described above are also disclosed.

Secondary treatment of films of colloidal quantum dots for optoelectronics and devices produced thereby

Growing community of inventors

Arvada, CO, United States of America

Matthew C Beard