Melilite oxychalcogenide Sr₂FeGe₂OS₆: a phase-matching IR nonlinear optical material realized by isomorphous substitution

Abstract

Transition-metal-based chalcogenides have recently emerged as great promising infrared nonlinear optical (IR-NLO) candidates due to their unique structural chemistries and rich optical properties. However, Fe-based IR-NLO chalcogenides with phase-matching (PM)...

Eu2MGe2OS6 (M = Mn, Fe, Co): Three Melilite-Type Rare-Earth Oxythiogermanates Exhibiting Balanced Nonlinear-Optical Behaviors

“…Notably, d-block transition metals (Mn 2+ , Fe 2+ , Co 2+ , etc.) can be used to design NLO materials due to their flexible tetrahedral or octahedral coordination configurations with chalcogen atoms. , As the first melilite-type transition-metal oxythiogermanate, Sr 2 CoGe 2 OS 6 exhibits a balanced NLO performance . Guided by these ideas, three pentanary melilite-type rare-earth (RE) transition-metal oxythiogermanates Eu 2 MGe 2 OS 6 (M = Mn, Fe, Co) were synthesized, and their crystal structures as well as optical properties are discussed.…”

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, 23–28 such as [GeOTe 3 ], [GeO 2 S 2 ], and [GeO 3 Se], identified in AE 3 Ge 2 O 4 Te 3 , 15,23 AEGeOS 2 , 25 and Sr 3 Ge 2 O 4 Se 3 , 27 respectively. However, the title compounds simultaneously contained two [GeO x S 4− x ] FBUs, namely, [GeOS 3 ] and [GeO 2 S 2 ].…”

Na6Sn3P4S16: Sn(ii)-chelated PS4 groups inspired an ultra-strong SHG response

“…[25][26][27][28][29][30] Notably, introducing two or more types of NLO-active functional units into one structure is an effective way to strengthen the SHG effect. [31][32][33] Moreover, strong covalent P-S bonds in the tetrahedral PS 4 also contribute to the improved NLO response, and a series of thiopho-sphates have become more established as IR NLO candidates. [34][35][36][37][38][39] On the basis of combining the above strategies, we have successfully synthesized a new NCS compound, Na 6 Sn 3 P 4 S 16 , in the thiophosphate system by coupling the SCALP cation Sn(II) and a PS 4 unit.…”