Solution‐Processed Spin‐Polarized Light‐Emitting Diodes of Colloidal Quantum Wells and Magnetic Nanoparticles
Year: 2025
Type: article
Abstract: Electrical injection of spin‐polarized carriers into semiconductors enables circularly‐polarized emission from spin‐polarized light‐emitting diodes (spin‐LEDs). The incredible level of tunability of magnetic and electronic properties in colloidal nanocrystals offers unprecedented opportunities for the modulation of polarization of light in solution‐processed spin‐LEDs based on magnetic nanoparticles unlike epitaxially grown spin‐LEDs restricted by a very limited range of materials for their exploitation, and solution‐processed spin‐LEDs based on chiral molecules, which do not allow the modulation of polarization in general. Here, it is shown that electrical injection of spin‐polarized electrons from magnetic Fe 3 O 4 nanoparticles into CdSe/CdZnS core/shell colloidal quantum wells (CQWs) in solution‐processed LEDs that allows for polarization modulation of electroluminescence. In this structure, a monolayer of face‐down oriented CQWs is deposited as an active layer to avoid polarization losses due to the hopping of the electrons between the CQWs before the radiative recombination process. In this solution‐processed spin‐LED, the circular polarization reaches 4.5% at 3 K and survives up to 100 K. A net circular polarization is observed at zero magnetic field up to 100 K because of the remnant magnetization of the Fe 3 O 4 nanoparticles. This new colloidal spin‐LED architecture presents significant prospects for future solution‐processed advanced opto‐spintronic devices.
Source: Advanced Optical Materials
Institutions: Bilkent University, Nanyang Technological University, National Nanotechnology Research Center, LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, University at Buffalo, State University of New York, Ankara Hacı Bayram Veli University, Qassim University, St. Bonaventure University, Northwestern University, Argonne National Laboratory, Center for Nanoscale Materials, International Institute for Nanotechnology
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,880
Funders: National Science Foundation, U.S. Department of Energy, Agency for Science, Technology and Research, Ministry of Education - Singapore, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, Ministry of Education, India, Office of Science, Division of Materials Research, Division of Electrical, Communications and Cyber Systems, Basic Energy Sciences
Awards: G102163711, G1232050757, G1286251239, G1311562894, G1482925484, G1643314494, G1654355420, G2287611682, G2313022816, G262962599, G3098495969, Magnetism, Spin Texture and Magnetotransport Phenomena in Covalent 2D Magnets, G3348321383, G3589692066, G426311843, G44630794, G498139845, G4999485031, G513797252, G5387317844, G6848031779, G6918803902, G7583137537, Collaborative Research: Chalcogenide Perovskite Light Emitting Diodes to Fill the Green Gap, G969889393, G993149817
OpenAlex ID: W4417447891