Abstract
Nonlinear optical materials are one of the key research objects in the field of optics, which mainly research the nonlinear effects of the interaction between luminesce and matter. Compared with inorganic nonlinear optical materials, organic nonlinear materials have outstanding advantages: strong adaptability, high flexibility, low cost, easy modification and damage resistance. In this review, the electric field induced second harmonic generation (EFISH) experimental technology is used to measure and research the nonlinearity of iridium metal complexes. And because of its structural diversity, people can design molecules according to their needs to get the best nonlinear optical response. Organic molecules with large nonlinear coefficients should have the following characteristics: asymmetric charge distribution, the delocalized nature of π electrons, and easy polarization by external electric fields, and a large π conjugated system. In recent years, metal organic compounds have become a leader in the field of optics, mainly because of their very good nonlinear optical properties. In the future, people will do more investigation on the nonlinearity of metal organic complexes. Researchers have shown great interest in iridium metal organic complexes due in particular to their attractive stability and nonlinear activity. This review mainly studies the nonlinear principle, performance test and Measurement of nonlinearity of iridium metal complexes. The nonlinear properties of other metal-metal organic complexes will not be discussed.
Highlights
The nonlinear optical effects of urea picric acid dinitroaniline and other organic compounds were discovered at the beginning of the study of nonlinear optical materials
Nonlinear polarimetry is one of the main indexes to measure the quality of nonlinear optical materials, and its size is directly related to the molecular structure
Studying the molecular nonlinear polarimetry at the molecular level is of great help to design new and efficient nonlinear optical devices
Summary
The nonlinear optical effects of urea picric acid dinitroaniline and other organic compounds were discovered at the beginning of the study of nonlinear optical materials. Iridium (III) complexes will undoubtedly become a hotspot in the research of second-order nonlinear optical materials because of their six-coordination, multiple valence states, diverse coordination forms and excellent performance [2]. Some non-linear effects of metal organic compounds had been discovered one after another. The molecular configuration has a direct effect on the nonlinear optical properties and color of the metal-organic complex. Due to the diversity of ligand metals, metal-organic compounds have various structures, which have more advantages than nonlinear optical materials composed of simple organic molecules. This review mainly studies the nonlinear optical principle, performance test and application of iridium metal complexes
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