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Article Abstract
Birefringent materials with high optical anisotropy have been identified as a research hotspot owing to their significant scientific and technological significance in modern optoelectronics for manipulating light polarization. Researchers studying borate systems have discovered that adding π-conjugated units placed in parallel can significantly increase the birefringence of crystalline solids; some examples include [BO] units, [BO] units, and [BO] units. However, there are not many borates with strictly parallel configurations of π-conjugated [BO] units. In this study, a new bimetallic borate SrCd(BO) with near-parallel arrangement of π-conjugated [BO] units was discovered. SrCd(BO) possesses the maximum number density of [BO] units, shortest dihedral angle of [BO] units (between the two [BO]), and largest degree of [CdO] octahedral distortion among all the currently known Sr-Cd-B-O tetragonal system borates, making it demonstrate a large birefringence of 0.102 at 532 nm. Theoretical analysis proves that π-conjugated [BO] anions are the primary source of the large birefringence of SrCd(BO).
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