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AXHg<sub>3</sub>P<sub>2</sub>S<sub>8</sub> (A <b>=</b> Rb, Cs; X <b>=</b> Cl, Br): New Excellent Infrared Nonlinear Optical Materials with Mixed‐Anion Chalcohalide Groups of Trigonal Planar [HgS<sub>2</sub>X]<sup>3−</sup> and Tetrahedral [HgS<sub>3</sub>X]<sup>5−</sup>
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Citations
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References
2021
Year
Mixed‐anion Chalcohalide GroupsOptical MaterialsEngineeringSolid-state ChemistryChemistrySpectroscopic PropertyIi-vi SemiconductorStrong Shg EfficiencyOptical PropertiesQuantum MaterialsLarge BandgapNanophotonicsMaterials SciencePhotonicsPhysicsNon-linear OpticOptoelectronic MaterialsPhotonic MaterialsNlo MaterialsCrystal Structure DesignOptoelectronicsTransition Metal ChalcogenidesNatural SciencesApplied PhysicsCrystalsFunctional Materials
Abstract A series of nonlinear optical (NLO) chalcohalides AXHg 3 P 2 S 8 (A = Rb, Cs; X = Cl, Br), which contain various Hg‐based building units including mixed‐anion trigonal planar [HgS 2 X] 3− and tetrahedral [HgS 3 X] 5− , are successfully synthesized. These compounds display good water resistance, wide infrared transparent region (0.42–17 µ m), high laser‐induced damage thresholds (4.5–6 × AgGaS 2 ), and strong phase‐matchable second harmonic generation (SHG) response close to AgGaS 2 . The mixed‐anion chalcohalide groups serving as functional building units in NLO materials are studied for the first time and proven to be very effective. This work opens a new avenue for new NLO material design to achieve the balance between strong SHG efficiency and large bandgap.
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