Polarized electroluminescence with magnetic spectral tuning in van der Waals magnet CrSBr

TL;DR

This paper demonstrates a novel van der Waals magnet device that achieves continuous spectral tuning and high polarization in electroluminescence, enabling reconfigurable polarized light sources for advanced optoelectronics.

Contribution

It introduces a new platform using CrSBr for continuous spectral and polarization control in electroluminescence, surpassing fixed-wavelength devices.

Findings

Achieves near 94.3% linear polarization in EL.

Enables magnetic-field-controlled spectral tuning.

Uses exciton-assisted inelastic tunneling in CrSBr.

Abstract

Polarized wavelength-tunable electroluminescence (EL) represents a critical on-demand functionality for next-generation optoelectronics. While conventional van der Waals (vdW) EL devices offer discrete wavelength switching constrained by fixed emission states, we report a novel platform enabling continuous spectral tuning combined with intrinsically polarized emission. By leveraging exciton-assisted inelastic tunneling in the anisotropic magnet CrSBr, our devices achieve uniform EL with a near unity degree of linear polarization ($\approx$ 94.3$\%$). The strong magneto-electronic coupling in CrSBr facilitates continuous magnetic-field-controlled spectral tuning through spin canting-induced band renormalization. This work establishes vdW magnets as a versatile platform for developing reconfigurable polarized light sources with simultaneous spectral and polarization control.