Two new non-centrosymmetric polar quaternary selenides, namely, RbZn In Se and CsZn In Se , have been synthesized and structurally characterized. They exhibit a 3D diamond-like framework (DLF) consisting of corner-shared MSe (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 RbZn In Se and 2.11 eV for CsZn In Se . Inspiringly, they exhibit a good balance between strong second harmonic generation (SHG) efficiency (3.9 and 3.5×AgGaS ) and high laser-induced damage thresholds (13.0×AgGaS ). Theoretical calculations based on density functional theory (DFT) methods confirm that such strong SHG responses originate from the 3D DLF structure.

The A 2 M II M IV 3 Q 8 family (A = alkali metal; M II = divalent metal; M IV = tetravalent metal; Q = chalcogenide) has attracted much attention because of its diverse structures and properties. Herein, we have successfully synthesized six new compounds as the first Mn-containing members of this family, Cs

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Balance is everything: Two new non‐centrosymmetric polar quaternary selenides, AZn4In5Se12 (A = Rb, Cs), which adopt a 3D diamond‐like framework (DLF) consisting of MSe4 (M = Zn/In) tetrahedra have been synthesized. These exhibit a good balance between strong second harmonic generation (SHG) efficiency (4×AgGaS2) and high laser‐induced damage thresholds (LIDTs) (13×AgGaS2). Upon analyzing their structure–property relationship, these DLF structures represent an unprecedented opportunity for the rational design and development of good IR nonlinear optical (NLO) materials. More information can be found in the Full Paper by Li‐Ming Wu et al. on page 453 in Issue 4, 2017 (DOI: 10.1002/asia.201601548).