Polarized Electroluminescence With Magnetic Spectral Tuning in Van Der Waals Magnet 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, a novel platform is reported that enables continuous spectral tuning combined with intrinsically polarized emission. By leveraging exciton‐assisted inelastic tunneling in the anisotropic magnet CrSBr, the devices achieve uniform EL with a near‐unity degree of linear polarization. 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.