DOE OSTI · 3374583
Solution‐Processed Spin‐Polarized Light‐Emitting Diodes of Colloidal Quantum Wells and Magnetic Nanoparticles
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.
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Delikanli, Savas [Bilkent University, Ankara (Turkey); Nanyang Technological University (Singapore)], Bhattacharya, Arinjoy [State University of New York at Buffalo, NY (United States)] (ORCID:0000000280194233), Canimkurbey, Betul [Bilkent University, Ankara (Turkey); Ankara Hacı Bayram Veli University (Turkey)], Huai, Chang [State University of New York at Buffalo, NY (United States)], Almutairi, Amani [State University of New York at Buffalo, NY (United States); Qassim University, Buraydah (Saudi Arabia)], Najafi, Arman [State University of New York at Buffalo, NY (United States)], Korkut, Hilal [Bilkent University, Ankara (Turkey)], Shabani, Farzan [Bilkent University, Ankara (Turkey)], Isik, Furkan [Bilkent University, Ankara (Turkey)], Pientka, James [St. Bonaventure University, NY (United States)], Sarpkaya, Ibrahim [Bilkent University, Ankara (Turkey)], Zeng, Hao [State University of New York at Buffalo, NY (United States)], Schaller, Richard D. [Northwestern University, Evanston, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)], Petrou, Athos [State University of New York at Buffalo, NY (United States)], Demir, Hilmi Volkan [Bilkent University, Ankara (Turkey); Nanyang Technological University (Singapore)] (ORCID:000000031793112X). 2025-12-17. Solution‐Processed Spin‐Polarized Light‐Emitting Diodes of Colloidal Quantum Wells and Magnetic Nanoparticles. https://doi.org/10.1002/adom.202502254
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