2D Inorganic Bimolecular Crystals with Strong In‐Plane Anisotropy for Second‐Order Nonlinear Optics

Abstract

Abstract2D inorganic bimolecular crystals, consisting of two different inorganic molecules, are expected to possess novel physical and chemical properties due to the synergistic effect of the individual components. However, 2D inorganic bimolecular crystals remain unexploited because of the difficulties in preparation arising from non‐typical layered structures and intricate intermolecular interactions. Here, the synthesis of 2D inorganic bimolecular crystal SbI3·3S8 nanobelts via a facile vertical microspacing sublimation strategy is reported. The as‐synthesized SbI3·3S8 nanobelts exhibit strong in‐plane anisotropy of phonon vibrations and intramolecular vibrations as well as show anisotropic light absorption with a high dichroism ratio of 3.9. Furthermore, it is revealed that the second harmonic generation intensity of SbI3·3S8 nanobelts is highly dependent on the excitation wavelength and crystallographic orientation. This work can inspire the growth of more 2D inorganic bimolecular crystals and excite potential applications for bimolecular optoelectronic devices.

Low‐Symmetry and Nontoxic 2D SiP with Strong Polarization‐Sensitivity and Fast Photodetection

“…Low-symmetry 2D layered materials exhibit unique anisotropic electronic, optoelectronic, and thermal properties, which expands their extraordinary potentials for designing various polarization-sensitive nano-devices. [1][2][3][4][5][6][7][8] Particularly in optoelectronics, the polarization sensitive photodetectors based on anisotropic 2D layered materials are superior in highly sensitive and remote detections. [9][10][11] As a pioneer of low-symmetry 2D layered materials, black phosphorus (BP) exhibits strong in-plane anisotropy due to its intrinsic puckered low-symmetry crystal structure.…”

2D Rare Earth Material (EuOCl) with Ultra‐Narrow Photoluminescence at Room Temperature

“…The B 1g mode exhibit four-lobed form in both two polarization configurations and can be fitted by classical Placzek approximation. [41] Under parallel polarization configuration, the B 1g mode exhibits maximum intensity at 0°, 90°, 180°, and 270°. Under perpendicular configuration, the B 1g mode has the strongest intensity at the rotation angle 50°, 140°, 230°, and 320°.…”

Programmable Polarization of 2D Anisotropic Rare Earth Material for Images Transmission and Encryption

“…There is difference in the polarized absorption for two orthogonal orientations in the range 500–1000 nm. [ 32,33 ] As the number of Eu 3+ ions in 2D Eu 2 O 3 flakes are relatively low and the absorption efficiency of Eu 3+ ions is low owing to their parity‐forbidden 4f transitions, the characteristic absorption peaks of Eu 3+ ions are not shown in Eu 2 O 3 flakes. [ 34,35 ] Eu 3+ ions possess fascinating luminescence properties arising from their unique 4f electronic configuration.…”