Birefringent materials play a significant role in modulating polarized light in optical communication and the laser industry. However, the discovery of deep ultraviolet (DUV, λ<200 nm) birefringent materials still faces a serious challenge. Herein, we propose hydroxylated π‐conjugated [B(OH)3] and [B3O3(OH)3] units for designing DUV birefringent materials. Innovatively, four new hydroxyborates have been synthesized under mild synthesis conditions. They present four novel pseudo layers that benefit from the large degree of freedom assembly modes of [B(OH)3] and [B3O3(OH)3] genes and large birefringence (0.057–0.123@532 nm). Moreover, the Cs3[B(OH)3]2Cl3 crystal features a short DUV cutoff edge (180 nm), which further indicates that the reported compounds are potential DUV birefringent crystals. Free and flexible assembly modes of π‐conjugated [B(OH)3] and [B3O3(OH)3] groups endow them a particular advantage as significant genes for exploring promising DUV birefringent materials.
Ultraviolet (UV) and Deep-UV (DUV, λ < 200 nm) nonlinear optical (NLO) materials play a significant role to convert the wavelength of laser for producing UV/DUV coherent light in the laser industry. The Al [Ne]3s 2 3p 1 atom with empty d orbitals can form sp 3 , sp 3 d, and sp 3 d 2 hybrid orbitals when bonding with O/F atoms, which leads to the construction of [AlO m F n ] (m + n = 4, 5, 6) units. Therein, aluminoborates have received intensive attention due to the effective structural and functional adjustment effects of the diverse AlÀ O/F units. Accordingly, numerous aluminoborates as candidates for the next generation of UV/DUV NLO materials were discovered. In this review, recently discovered aluminoborates are overviewed and analyzed, including their syntheses, crystal structure features, and second-order NLO performances. We aim to provide the latest progress and outlook on the crystal chemistry of aluminoborates and boost the finding of the next NLO candidates with high performances.
CsAB8O12F2·CsI (A = K+, NH4+), with benign layered structures, were designed using the strategy of salt-inclusion based on the typical fluorooxoborate template. CsKB8O12F2·CsI achieves suitable birefringence (0.08 at 1064 nm)...
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