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An on‐chip polarized light source is desirable in signal processing, optical communication, and display applications. Layered semiconductors with reduced in‐plane symmetry have inherent anisotropic excitons that are attractive candidates as polarized dipole emitters. Herein, the demonstration of polarized light‐emitting diode based on anisotropic excitons in few‐layer ReS2, a 2D semiconductor with...