A Series of Organic–Inorganic Hybrid Compounds [(C2H5)4N]InCl4–xBrx (x = 0, 2, 4): Synthesis, Crystal Structure, and Nonlinear Optical Properties
2020
A series of noncentrosymmetric
(NCS) tetraethylammonium tetrahalide
indium hybrids, [(C2H5)4N]InCl4–xBrx (x = 0, 2, 4), was synthesized by a hydrothermal reaction.
Their structures, thermal properties, and linear and nonlinear optical
properties were identified. The crystals belong to an isomorphic hexagonal
system and feature zero-dimensional structures containing isolated
distorted InCl4–xBrx– tetrahedra with [N(C2H5)4]+ cations inserted as charge
balance. On the basis of the powder second harmonic generation, the
SHG levels of [(C2H5)4N]InCl4–xBrx (x = 0, 2, 4) were estimated to be approximately 0.5, 0.7,
0.8 × KDP, respectively. The relationship between halogen composition
and band gap, optical anisotropy, and frequency doubling effects were
evaluated by first-principles calculations, thus suggesting that halogen
regulation favors the design of new organic–inorganic hybrid
halides with excellent performances for many optoelectronic applications.
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