Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 43, Pages 10407-10412Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201701679
Keywords
AZn(4)Ga(5)S(12); diamond-like structure; nonlinear optics; second harmonic generation efficiency; wide band gap
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Funding
- NSF of China [21301175, 21233009, 21571020, 91422303, 21671023]
- NSF of Fujian Province [2015J01071]
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Mid-infrared (MIR, 2-20 mu m) second-order nonlinear optical (NLO) materials with outstanding performances are of great importance in laser science and technology. However, the enormous challenge to design and synthesize an excellent MIR NLO material lies in achieving simultaneously a strong second harmonic generation (SHG) response [d(ij) > 0.6 x AgGaS2 (AGS)] and wide band gap (E-g > 3.5 eV). Herein three new MIR NLO materials, AZn(4)Ga(5)S(12) (A = K, Rb, Cs) are reported, which crystallize in the KCd4Ga5S12-type structure and adopt a 3D diamond-like framework (DLF) con-sisting of MS 4 (M= Zn/Ga) tetrahedra; achieving the desired balance with strong powder SHG response (1.2-1.4 x AGS) and wide band gap (Eg approximate to 3.65 eV). Moreover, they also show large laser induced damage thresholds (LIDTs, 36 x AGS), a wide range of optical transparency (0.4-25 mu m) and ultrahigh thermal stability (up to 1400 K). Upon analyzing the structure-property relationship of AX(4)(II)X(5)(III)Q(12) family, these 3D DLF structures can be used as a highly versatile and tunable platform for designing excellent MIR NLO materials.
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