Journal
ADVANCED MATERIALS
Volume 31, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201806817
Keywords
molecular spintronics; multifunctional spintronic devices; spin-injection; spin-OLED
Categories
Funding
- European Union (EU) (COST Action Molecular Spintronic) [MOLSPIN-CA15128]
- European Union (EU) [FET-OPEN 2D-INK 664878]
- European Union (EU) (European Research Council Advanced (ERC Advanced)) [ERC-2018-AdG Mol-2D 788222]
- Spanish Ministerio de Economia y Competitividad (MINECO) - FEDER [MAT2017-89993-R]
- Spanish Ministerio de Economia y Competitividad (MINECO) - Unit of Excellence Maria de Maeztu [MDM-2015-0538]
- Generalitat Valenciana (Prometeo Program)
- Spanish MINECO
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [725767-hyControl]
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The quest for a spin-polarized organic light-emitting diode (spin-OLED) is a common goal in the emerging fields of molecular electronics and spintronics. In this device, two ferromagnetic (FM) electrodes are used to enhance the electroluminescence intensity of the OLED through a magnetic control of the spin polarization of the injected carriers. The major difficulty is that the driving voltage of an OLED device exceeds a few volts, while spin injection in organic materials is only efficient at low voltages. The fabrication of a spin-OLED that uses a conjugated polymer as bipolar spin collector layer and ferromagnetic electrodes is reported here. Through a careful engineering of the organic/inorganic interfaces, it is succeeded in obtaining a light-emitting device showing spin-valve effects at high voltages (up to 14 V). This allows the detection of a magneto-electroluminescence (MEL) enhancement on the order of a 2.4% at 9 V for the antiparallel (AP) configuration of the magnetic electrodes. This observation provides evidence for the long-standing fundamental issue of injecting spins from magnetic electrodes into the frontier levels of a molecular semiconductor. The finding opens the way for the design of multifunctional devices coupling the light and the spin degrees of freedom.
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