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Updated: Nov 14, 2025
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
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Chiral-induced spin selectivity enables a room-temperature spin light-emitting diode.
Young-Hoon Kim1, Yaxin Zhai1, Haipeng Lu1
1Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO 80401, USA.
Science (New York, N.Y.)
|March 12, 2021
Summary
This study introduces a novel spin-LED operating without magnetic fields or ferromagnetic contacts, utilizing chiral-induced spin selectivity (CISS) for room-temperature, spin-polarized light emission.
Area of Science:
- Optoelectronics
- Spintronics
- Materials Science
Background:
- Traditional optoelectronic devices require electric and magnetic fields for spin, charge, and light control.
- Spin-LEDs typically use electric fields for carrier injection and magnetic fields or ferromagnetic contacts for spin polarization.
- Achieving spin control in optoelectronics without external magnetic fields or ferromagnetic materials presents a significant challenge.
Purpose of the Study:
- To demonstrate a spin-polarized light-emitting diode (spin-LED) that operates without magnetic fields or ferromagnetic contacts.
- To leverage chiral-induced spin selectivity (CISS) for generating spin-polarized carriers.
- To achieve room-temperature operation of a CISS-based spin-LED.
Main Methods:
- Utilized chiral-induced spin selectivity (CISS) to generate spin-polarized carriers.
- Fabricated a spin-LED incorporating a CISS layer composed of oriented, self-assembled chiral molecules within a hybrid semiconductor framework.
- Operated the device at room temperature without the need for external magnetic fields or ferromagnetic contacts.
Main Results:
- Successfully demonstrated a functional spin-LED operating at room temperature.
- Achieved circularly polarized electroluminescence with an intensity of ±2.6%.
- Confirmed the efficacy of the CISS layer in producing spin-polarized carriers without magnetic or ferromagnetic components.
Conclusions:
- Chiral-induced spin selectivity (CISS) offers a viable pathway for developing magnetic-field-free, ferromagnetic-free spin-LEDs.
- The developed spin-LED technology operates effectively at room temperature.
- This approach advances the field of spintronics and optoelectronics by enabling simpler, more efficient spin-polarized light emission.
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