A Highly Optical Anisotropic Hybrid Metal Halide for Modulation and Generation of Polarized Light

Abstract Polarized light is critical for a wide range of applications in modern optics. However, its generation and modulation typically require additional optical comments, which hinders device compactness. Herein, an air‐stable Tin(IV)‐based hybrid metal halide, (C ₁₀ H ₉ N ₂ O) ₂ SnCl ₆ , composed of [C ₁₀ H ₉ N ₂ O] ⁺ cations and isolated [SnCl ₆ ] ²⁻ octahedra is reported. Notably, (C ₁₀ H ₉ N ₂ O) ₂ SnCl ₆ exhibits a robust birefringence of 0.50@550 nm that is evidently larger than those of commercially used crystals, which enables efficient modulation of polarized light. Moreover, it possesses a broad polarized blue emission in the range of 374–600 nm with a peak at 426 nm. Theoretical and structural studies reveal that the high optical anisotropy for large birefringence and directly polarized emission of (C ₁₀ H ₉ N ₂ O) ₂ SnCl ₆ is ascribed to the cooperative effect of distortion of [SnCl ₆ ] ²⁻ and high π ‐conjugation of [C ₁₀ H ₉ N ₂ O] ⁺ in parallel arrangement. This work may provide new thoughts on designing and realizing the miniaturization of polarization‐resolved optoelectronic devices.