Two new quaternary selenides AAgGaSe, (A = Rb, 1; Cs, 2) were synthesised solid-state reaction in sealed silica tubes. Compounds 1 and 2 crystallised in the monoclinic space group (no. 8) and their three-dimensional [AgGaSe] anionic frameworks were comprised of AgSe and GaSe tetrahedrons. Their UV-Vis-near infrared diffuse reflectance spectra showed that 1 and 2 possessed wide band gaps of 2.17 and 2.10 eV, respectively. Notably, under incident laser irradiation at 1910 nm, compounds 1 and 2 presented moderate second-harmonic generation responses of 0.6 and 0.7 × AgGaS, respectively, with phase-matching behaviours due to the parallel arrangement of nonlinear optical (NLO) functional tetrahedral AgSe and GaSe units. The laser-induced damage thresholds of 1 and 2 were estimated to be 25.4 and 18.0 MW cm, respectively, which were 2.1 and 1.5 times the threshold of AgGaS. This study revealed that the title selenides, which were constructed from tetrahedral units arranged in a parallel array, are promising infrared NLO materials.
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Article Synopsis
- This paper explores silver gallium selenide (AGSe) as a better option than silver gallium sulfide (AGS) for detecting infrared signals beyond 10 µm, particularly in the 10 to 20 µm range.
- AGSe has a wider transparency range up to approximately 20 µm, while AGS has limitations due to high absorption beyond 12 µm.
- Experimental comparisons show that AGSe achieves higher upconversion efficiency and better phase matching, making it a strong candidate for long-wavelength infrared detection applications.
AAgGaSe (A = Rb, Cs): second-harmonic generation responses realized through the parallel arrangement of AgSe and GaSe tetrahedrons.
Dalton Trans
July 2022
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
Two new quaternary selenides AAgGaSe, (A = Rb, 1; Cs, 2) were synthesised solid-state reaction in sealed silica tubes. Compounds 1 and 2 crystallised in the monoclinic space group (no. 8) and their three-dimensional [AgGaSe] anionic frameworks were comprised of AgSe and GaSe tetrahedrons.
View Article and Find Full Text PDFA novel promising infrared nonlinear optical selenide KAgGaSe designed from benchmark AgGaQ (Q = S, Se).
Chem Commun (Camb)
January 2021
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P. R. China.
Obtaining fresh nonlinear optical (NLO) materials is an attractive and challenging topic for the development of laser techniques. Using benchmark AgGaQ (Q = S, Se) as the template, new KAgGaSe is obtained by a solid-state reaction. Its structure can be built by the intergrowth of 2 : 1 AgGaSe and GaSe-like slabs if the K site is occupied by Ag.
View Article and Find Full Text PDFA new optical parametric amplifier based on lithium thioindate used for sum frequency generation vibrational spectroscopic studies of the amide I mode of an interfacial model peptide.
Appl Spectrosc
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Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, USA.
We describe a new optical parametric amplifier (OPA) that employs lithium thioindate, LiInS2 (LIS), to create tunable infrared light between 1500 cm(-1) and 2000 cm(-1). The OPA based on LIS described within provides intense infrared light with a good beam profile relative to similar OPAs built on silver gallium sulfide, AgGaS2 (AGS), or silver gallium selenide, AgGaSe2 (AGSe). We have used the new LIS OPA to perform surface-specific sum frequency generation (SFG) vibrational spectroscopy of the amide I vibrational mode of a model peptide at the hydrophobic deuterated polystyrene (d8-PS)-phosphate buffered saline interface.
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