Chiral-Induced Spin Selectivity Enabling a Room-Temperature Spin Light-Emitting Diode
March 12, 2021
Chiral-induced spin selectivity (CISS) was used to produce spin-polarized carriers and demonstrate a spin-LED that operates at room temperature without magnetic fields or ferromagnetic contacts.
We developed an LED based on solution-processed metal halide perovskites that used a spin-polarized injection layer, which causes emission of circularly polarized light at room temperature without magnetic field.
Significance and Impact
Controlling the efficient interconversion of light, spin, and charges is essential for the next generation of low-cost energy technologies. A spin-LED operates through the injection and recombination of spin-polarized carriers.
- Constructed a heterostructure bilayer from a chiral metal-halide layer with a brightly emitting metal-halide NC layer.
- Measured polarized current injection in multiple ways and correlated to the emitted circularly polarized light.
- Exchanged cation at the heterostructure interface promotes carrier localization and spin-polarization.