Halogen regulation triggers NLO and dielectric dual switches in hybrid compounds with green fluorescence

Abstract

Hybrid metal halides with nonlinear optical (NLO) and dielectric dual switching properties are a class of materials with great application prospects in the fields of optoelectronics and smart devices. However,...

Symmetry breaking of A3M2X9-type perovskite derivatives induced by polar quaternary ammonium cations: achieving efficient nonlinear optical properties

“…Obviously, as shown in Fig. 3b, (BTA) 3 Bi 2 Cl 9 exhibits a good SHG response that is 1.39 times that of benchmark KDP at a particle size of 250-315 μm, which is much stronger than most organic-inorganic hybrid lead-free metal halides, such as [N(C 2 H 5 ) 4 ]InCl 4−x Br x (0.5-0.8 × KDP), 52 (Br-MM) 2 MnBr 4 (0.3 × KDP), 53 (C 6 H 14 N) 2 SbCl 5 (0.3 × KDP), 54 [C 5 H 12 N]SnCl 3 (1.1 × KDP) 55 and [NH 3 CH 2 CH 2 F] 3 BiCl 6 (0.6 × KDP) 56 (Table S6 †). Furthermore, the dipole moment (DM)…”

Thermally-driven unusual dual SHG switching with wide SHG-active steps triggered by inverse symmetry breaking

“…However, the centrosymmetric crystal structures make SHG signals inactive in most multi-step phase transition compounds. [35][36][37] In particular, realizing the unusual "off-on-off" SHG switching material is a considerable challenge. In the limited relevant reports, the examples of [C 4 H 10 N][CdCl 3 ], 32 [CoII(en) 3 ](SO 4 ), 33 cyclohexylmethylammonium bromide, 34 and [azetidinium]CdCl 3 38 show the "off-on-off" two-step SHG switching behaviors, which promote the development of novel two-step NLO switches.…”

Hydrogen Bond-Driven Order–Disorder Phase Transition in the Near-Room-Temperature Nonlinear Optical Switch [Ag(NH3)2]2SO4

“… 7 − 9 However, such a phase transition is relatively rare, most of which is trigged by the structure conformation or orientation changes stimulated by the external stimuli, 8 − 11 and some are related to the disorder or rearrangement of atoms/groups in the structure. 8 − 13 The latter are found in some organic salts, such as (Hdabco)(CF 3 COO), 14 host–guest inclusion compounds, e.g., (dipropylamine)(18-crown-6)ClO 4 , 15 and organic–inorganic hybrids, such as (Me 3 NNH 2 ) 2 CdI 4 16 and (C 4 H 12 NO)MnCl 3 . 17 Previously, we report an inorganic NLO switch material, K x (NH 4 ) 2– x PO 3 F ( x = 0–0.3), showing the widest switching temperature range from 150 to 270 K benefiting from the continuously tunable T c , which is adjustable by controlling the number of hydrogen bonds within the crystal structure.…”

“…Inorganic solid-state nonlinear optical (NLO) materials, as the key material of the all-solid-state laser devices, have been extensively studied and are widely applied in many fields, such as information processing, precision manufacturing, and telecommunications. − Among them, the second-order nonlinear optical materials showing the second harmonic generation (SHG) have greatly broadened the application range of nonlinear optics . The NLO switch materials are potentially useful in applications such as sensors, information storage, and switching devices. , The switching between the SHG-on and SHG-off states under the external stimuli such as heat, light, pressure, etc., is associated with a reversible phase transition from a noncentrosymmetric (NCS, SHG-on state) to centrosymmetric (CS, SHG-off) structure. − However, such a phase transition is relatively rare, most of which is trigged by the structure conformation or orientation changes stimulated by the external stimuli, − and some are related to the disorder or rearrangement of atoms/groups in the structure. − The latter are found in some organic salts, such as (Hdabco)­(CF 3 COO), host–guest inclusion compounds, e.g., (dipropylamine)­(18-crown-6)­ClO 4 , and organic–inorganic hybrids, such as (Me 3 NNH 2 ) 2 CdI 4 and (C 4 H 12 NO)­MnCl 3 . Previously, we report an inorganic NLO switch material, K x (NH 4 ) 2– x PO 3 F ( x = 0–0.3), showing the widest switching temperature range from 150 to 270 K benefiting from the continuously tunable T c , which is adjustable by controlling the number of hydrogen bonds within the crystal structure .…”