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Non-centrosymmetric Selenides AZn 4 In 5 Se 12 (A=Rb, Cs): Synthesis, Characterization and Nonlinear Optical Properties.
Chemistry, An Asian Journal 2017 Februrary 17
Two new non-centrosymmetric polar quaternary selenides, namely, RbZn4 In5 Se12 and CsZn4 In5 Se12 , have been synthesized and structurally characterized. They exhibit a 3D diamond-like framework (DLF) consisting of corner-shared MSe4 (M=Zn/In) tetrahedra, in which the A+ ions are located. Both compounds are thermally stable up to 1300 K and exhibit large transmittance in the infrared region (0.65-25 μm) with measured optical band gaps of 2.06 eV for RbZn4 In5 Se12 and 2.11 eV for CsZn4 In5 Se12 . Inspiringly, they exhibit a good balance between strong second harmonic generation (SHG) efficiency (3.9 and 3.5×AgGaS2 ) and high laser-induced damage thresholds (13.0×AgGaS2 ). Theoretical calculations based on density functional theory (DFT) methods confirm that such strong SHG responses originate from the 3D DLF structure.
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