Non‐Linear Optical Properties of the (RE)₃CuGeS₇ Family of Compounds

Abstract

Non‐linear optical materials must possess a balanced combination of laser‐induced damage threshold (LDT) and second‐harmonic generation (SHG) and be phase matchable. In our previous work, chiral and polar La3CuGeS7 was identified as a promising non‐linear optical material. Herein, we report the optimization of non‐linear optical properties through replacement of La with smaller lanthanides. It is determined that Gd3CuGeS7 exhibits the best combination of SHG (1.6× AgGaS2 at 88–105 μm particle size) and LDT (3× AgGaS2, 89 MW/cm2) and is phase matchable. Based on changes in metal‐sulfur bond lengths and angles, we further propose structural optimization through solid‐solution formation and doping.

Probing of the Noninnocent Role of P in Transition-Metal Phosphide Hydrogen Evolution Reaction Electrocatalysts via Replacement with Electropositive Si

“…The success of the arc-melted Ni–Si precursor relies on the idea that both refractive elements are introduced into the reaction medium with P at the same time and are both in close spatial proximity. This methodology works well for the synthesis of many complex ternary and multinary materials. − Interestingly, using the arc-melted precursor methodology, a new Ni 3 SiP 2 phase was synthesized along with the reported Ni 2 SiP, Ni 5 Si 2 P 3 , and Ni 7 Si 2 P 5 phases. Reference materials were synthesized by arc-melting for NiSi, and by the direct reaction of Ni and P in a stoichiometric ratio in identical conditions to those of NiSi 1– x P x for Ni 5 P 4 (Figure S2).…”

Rb2Sn4Q9 (Q = S and Se): Low-Dimensional Noncentrosymmetric Chalcogenides with High Laser-Induced Damage Threshold

“…7,17,18 In general, 3D chalcogenides with wide band gaps demonstrate high LIDT, yet their SHG response is often lower compared to the less explored low-dimensional chalcogenides. 19 However, these low-dimensional chalcogenides show significant promise, exhibiting higher SHG responses when compared with their 3D counterparts. Song et al 20 studied the electronic structures of AAsQ 2 (A = alkali-metals; Li, Na, and K; Q = S and Se), a family of low-dimensional compounds characterized by 1D 1 / ∞ [AsQ 2 − ] chains.…”

“…Several reviews in the literature have discussed the existence of NC chalcogenide structural prototypes, encompassing zero-dimensional (0D) to three-dimensional (3D) configurations. ,,– NC structures are dominated by 3D structures (∼70%) primarily belonging to the chalcopyrite, for example, AgGaSe 2 and the RE 3 MM ′ Q 7 family. ,, In general, 3D chalcogenides with wide band gaps demonstrate high LIDT, yet their SHG response is often lower compared to the less explored low-dimensional chalcogenides . However, these low-dimensional chalcogenides show significant promise, exhibiting higher SHG responses when compared with their 3D counterparts.…”

BaCu2SiS4: A New Member of the AIIBI2MIVQ4 Chalcogenide Family with a Chiral Crystal Structure

“…The arrangement of different types of metal chalcogenide polyhedra in a noncentrosymmetric manner often yields potential IR-NLO materials in a variety of structure types. [3,25,27,[29][30][31][32][33][34][35][36][37][38] Two examples of commercial IR-NLO chalcogenide materials are AgGaS 2 and AgGaSe 2 . [3,37,38] To achieve a better combination of SHG and LDT, the search for novel materials with improved NLO properties has led to the investigation of promising ternary or multinary chalcogenide phases.…”

“…The interest in chalcogenides for nonlinear applications arises from their crystal structures. The arrangement of different types of metal chalcogenide polyhedra in a noncentrosymmetric manner often yields potential IR‐NLO materials in a variety of structure types [3,25,27,29–38] . Two examples of commercial IR‐NLO chalcogenide materials are AgGaS 2 and AgGaSe 2 [3,37,38] .…”