LaAeAl₃S₇(Ae = Ca, Sr): Cairo pentagonal layered thioaluminates achieving a good balance between a strong second harmonic generation response and a wide bandgap

Abstract

Breaking through the incompatibility between strong second harmonic generation (SHG) response and wide bandgap in one infrared nonlinear optical (IR NLO) crystal is still a huge challenge. With this in...

Advances in Solid-State Nonlinear Optical Materials: From Fundamentals to Applications

“…Apart from these compounds, some other recently developed chalcogenides meet the conditions of E g ≥ 3.5 eV and d ij ≥ 1 × AGS and thus can be potential candidates as promising IR NLO materials. For example, LaSrAl 3 S 7 46 exhibits exhibited a wide energy gap (E g ) of 3.78 eV and a strong SHG response of 1.1 × AGS at 2090 nm, with a particle size ranging from 200 to 250 μm. These exceptional properties can be attributed to the joint effect of [AlS 4 ] and [(La/Sr)S 8 ] units.…”

A new infrared nonlinear optical material BaZnGeS4 with a wide band gap and large nonlinear optical response

“…[18][19][20] To obtain a strong NLO response and wide IR transparent region, chalcogenides have been regarded as a promising system, [21][22][23][24][25][26] and to produce a wide band gap, introducing alkali and/or alkaline earth metal (AEM) without d-d and f-f electron transitions has been recognized as a feasible strategy. [27][28][29][30][31][32] Recently, the quaternary A II B II C IV D 4 VI family compounds with abundant and adjustable structure sites have received considerable attention in the design of high-performance IR NLO materials. 33 However, most of the developed compounds in the A II B II C IV D 4 VI family show narrow band gaps (≤3.0 eV).…”

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

“…[16][17][18] So far, extensive work has been undertaken to explore IR NLO materials and several effective design strategies have been proposed: for example, coupling highly distorted anionic units into a structure, such as various anionic groups with centered d 0 or d 10 transition metals or stereochemically active lone-pair (SCALP) cations, has been proven to have a positive impact on the SHG response. [19][20][21][22][23] In addition, introducing alkali or alkaline-earth metals as cations into crystal structures can effectively broaden the optical bandgap of targeted crystals. 24 Recently, chalcogenides containing SCALP metal cations (Sn 2+ , Pb 2+ , As 3+ , Sb 3+ and Bi 3+ ) were selected as optimal systems to search for IR NLO materials with strong SHG effects.…”