Bridging oxygen atoms in trigonal prism units driven strong second-harmonic-generation efficiency in Sr₃Ge₂O₄Te₃

Abstract

Herein, a novel IR NLO oxytelluride Sr3Ge2O4Te3 was successfully designed and synthesized through “partially O-to-Te substitution” strategy. Compared with the parent oxide, Sr3Ge2O4Te3 not only successfully achieves a phase-matchability transition...

Heteroanion-introduction-driven birefringence enhancement in oxychalcogenide Ba3MIIGe3O2S8 (MII = Mn, Cd)

“…Furthermore, through comparing and analyzing the reported oxychalcogenides, we discovered that Ba 3 M II Ge 3 O 2 S 8 (M II = Mn, Cd) demonstrated structural novelty in three distinct aspects. First, the heteroanionic [GeO x Q 4−x ] FBUs can only exist in a singular form in oxychalcogenides, [23][24][25][26][27][28] 32 and [CoOS 3 ] in CaCoOS. 33 Notably, in contrast to the previously reported four-coordinated [TMO x Q y ], two new heteroanionic FBUs, [MnOS 5 ] and [CdOS 5 ], were successfully observed in Ba 3 M II Ge 3 O 2 S 8 (M II = Mn, Cd) for the first time, which enhances the diversity of oxychalcogenides.…”

ACd4Ga5Te12 (A = K, Rb, Cs): Tellurides with a Strong Nonlinear Optical Response and Purple Emission

“…The methodology − the authors used for calculating linear and nonlinear optical properties in the sum-of-states method is similar to previous work, such as Sr 3 Ge 2 O 4 Te 3 , where detailed references could be found …”

“…The methodology 73−75 the authors used for calculating linear and nonlinear optical properties in the sum-of-states method is similar to previous work, such as Sr 3 Ge 2 O 4 Te 3 , where detailed references could be found. 36 ■ RESULTS AND DISCUSSION Crystal Structure. KCd 4 Ga 5 Te 12 was obtained for the first time, and it was crystallized in the R3 space group.…”

“…In addition, it is more difficult to investigate some metastable NCS compounds, as we cannot synthesize and evaluate their NLO performances. In recent years, some strategies have been proposed to obtain NCS compounds, including using known NCS structures as templates, element substitution, concentration-driven strategy, structural tolerance factor-guided strategy, etc. ,− Among them, the chemical substitution of known CS or NCS structures has been proven to be the most effective and simple strategy for designing new excellent IR NLO compounds. − Selecting an appropriate structural prototype is conducive to the realization of structure–performance regulation. Some examples with favorable NLO properties have been rendered here, encompassing Pb 4 SeBr 6 (structural prototype: CS PbBr 2 ), SrCdSiS 4 (structural prototype: CS SrGa 2 S 4 ), Sn 7 Br 10 S 2 (structural prototype: CS SnBr 2 ), [RbBa 2 Cl]­[Ga 4 S 8 ] (structural prototype: CS RbGaS 2 ), CuZnPS 4 (structural prototype: NCS AgGaS 2 ), Ba 3 Ge 2 O 4 Te 3 (structural prototype: NCS Ba 2 ZnGe 2 O 7 ), and Hg 3 P 2 S 8 (structural prototype: NCS Zn 3 P 2 S 8 ). ,− …”

Anisotropic structure building unit involving diverse chemical bonds: a new opportunity for high-performance second-order NLO materials

“…The NCS Sr 3 Ge 2 O 4 Q 3 (Q = Se, Te) reported by Guo and Yao groups 118–120 crystallizes in the hexagonal space group R 3 m (no. 160) featuring an isolated Ge 2 O 4 Q 3 dimer that is formed by a highly polar (GeOQ 3 ) 4− tetrahedron sharing the corner O with a tetrahedral (GeO 4 ) 4− unit (Fig.…”