Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 5, Pages 1876-1884Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b00177
Keywords
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Funding
- National Natural Science Foundation of China [21225104, 21233009, 21171168, 21301175, 91422303]
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The well-known polar R(3)MTQ(7) is a large family of noncentrosymmetric chalcogenides, and despite of adopting the same crystal structure type, its members show distinctively different nonlinear optical (NLO) properties, which is quite unusual. Yet, the intrinsic reason remains unknown. Herein, we report the discovery of six new members, La3Ga0.5(Ge-0.5/Ga-0.5)S-7 (1), La3In0.5(Ge-0.5/In-0.5)S-7 (2), Sm3Ga0.5(Ge-0.5/Ga-0.5)S-7 (3), La3In0.33GeS7 (4), Sm3In0.33GeS7 (5), and Gd3In0.33GeS7 (6). Remarkably, polycrystalline 1 and 2 show the strongest second harmonic generation (SHG) of this family, 4.8 and 1.8 times that of the benchmark AgGaS2 at 2.05 mu m in the same particle size of 74-106 mu m. For the first time we reveal that for the R(3)MTQ(7) family the atomic distribution mainly determines the NLO property, and members showing strong SHG must have a formula of R(3)M(0.5)TQ(7). Furthermore, we illustrate whether the building unit MS6 octahedron is half occupied (1-3) or one-third occupied (4-6) is total energy driven and charge balance controlled.
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