A novel acid-controlled second-order nonlinear optical switch based on dimethyldihydropyrene/cyclophanediene photoswitch

Abstract

Nonlinear optical (NLO) switches, especially for multi-state NLO switches, have attracted much attention because of their applications in optical memory with multiple storage and nondestructive capacity. However, it is still...

Torsion Angles between Donor and Acceptor Moieties as a Descriptor for Designing Nonlinear Optics and Thermally Activated Delayed Fluorescence Materials

“…NLO/TADF materials take pivotal positions in the development of the advanced technologies of optical frequency conversion and organic light-emitting diodes (OLEDs), − respectively. Recent years have witnessed a growing interest in the design of high-performance NLO/TADF materials to meet the requirements of practical applications. − It is widely recognized that β plays a decisive role in the performance of NLO materials. Thus, as an effective strategy to increase β, the design of strong intramolecular charge transfer (ICT) molecules with twisted D–A architecture has emerged as a novel frontier in materials science. ,,,,− Actually, twisted D–A molecules are extensively utilized for constructing the high-performance TADF material as well. − ,− It is largely because of the fact that reasonable D–A architecture can help to separate the highest occupied molecular orbital from the lowest occupied molecular orbital, resulting in a lower Δ E ST .…”

“…Recent years have witnessed a growing interest in the design of high-performance NLO/TADF materials to meet the requirements of practical applications. − It is widely recognized that β plays a decisive role in the performance of NLO materials. Thus, as an effective strategy to increase β, the design of strong intramolecular charge transfer (ICT) molecules with twisted D–A architecture has emerged as a novel frontier in materials science. ,,,,− Actually, twisted D–A molecules are extensively utilized for constructing the high-performance TADF material as well. − ,− It is largely because of the fact that reasonable D–A architecture can help to separate the highest occupied molecular orbital from the lowest occupied molecular orbital, resulting in a lower Δ E ST . Thus, the dihedral angles between donor and acceptor units, reflecting the degree of distortion, become a very important factor in the inherent electronic properties. ,,− However, the precise control of θ to optimize the performances of NLO/TADF materials remains very challenging.…”

Intramolecular boron-locking strategy induced remarkable first hyperpolarizability: role of torsion angles between donor and acceptor units

“…2,10,11 In terms of those effective approaches to enhance hyperpolarizabilities, constructing organic molecules with donor–acceptor (D–A) architecture has emerged as a hot topic. 6–9,12–14 Moreover, it has been confirmed that inherent NLO properties, such as the first hyperpolarizability, are closely related to the torsion angle between donor and acceptor moieties, which demonstrates that controlling torsion angles between donor and acceptor units has become a key factor for obtaining high performance NLO materials. 8,9,15–17 To data, it is still an open issue to find a robust approach to control torsion angles to achieve high performance NLO materials.…”

“…In recent years, the field of nonlinear optics (NLO) has received much attention as researchers aim to design high performance NLO materials to meet the growing requirements of practical applications in dynamic image processing, optical frequency conversion and data storage. [1][2][3][4][5][6][7][8][9] Great effort has been put into designing NLO materials with large hyperpolarizabilities, consequently, some effective approaches to enhance hyperpolarizabilities have been proposed. 2,10,11 In terms of those effective approaches to enhance hyperpolarizabilities, constructing organic molecules with donor-acceptor (D-A) architecture has emerged as a hot topic.…”

Supramolecular Metal Halide Complexes for High-Temperature Nonlinear Optical Switches

“…Nonlinear optical (NLO) switching phenomena refer to changes in the NLO properties of materials in response to external stimuli such as electromagnetic field, heat, pH variations, and pressure. − In conventional linear optics, the response of a material to light is directly proportional to the intensity of the incident light. However, in NLO optics, the response goes beyond linear relationships and involves higher-order effects, such as second-harmonic generation (SHG). , In solid-state NLO switches, the switchable nonlinear response is achieved by breaking the chemical bonds, tuning the molecular configurations, or harnessing the misalignment of dipoles.…”