期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 48, 页码 53950-53956出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c15812
关键词
second harmonic generation; metal chalcogenide; IR nonlinear optical functional motif; surfactant-thermal method; mixed covalent-ionic compound
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- Chinese Academy of Sciences [YJKYYQ20180006]
- NSF of China [21827813, 21921001, 21701176]
- Scientific Research Fund of Natural Science Foundation of Fujian Province, China [2018J05034]
Exploration of a new nonlinear optical (NLO)-active functional motif is important in the rational design of promising infrared (IR) NLO materials. Compared with typical tetrahedral MQ(4) (M = IIB, III, IV metals; Q = S, Se) motifs, MQ(3) (M = As, Sb) pyramids favor high second-harmonic generation (SHG) efficiency while frequently hindering phase matching (PM) because of excessively large optical anisotropy. The surfactant-thermal method was first adopted to achieve PM in MQ(3)-containing systems and synthesize mixed covalent-ionic IR NLO materials. Two new thioarsenates of AMnAs(3)S(6) (A = Cs, Rb) exhibiting strong PM SHG efficiencies comparable to commercial AGS and laser-induced damage thresholds of one order higher than AGS were obtained. The [As3S6](3-) unit in their structures is an unprecedented NLO-active functional motif; which can be useful in designing new IR NLO compounds with large SHG efficiency. In addition, the surfactant-thermal method provides a new general strategy for synthesizing new IR NLO materials.
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