Synthesis, crystal growth and characterization of a D-π-A type novel organic nonlinear optical single crystal

Menezes, Anthoni Praveen; Jayarama, A.; Ng, Seik Weng

doi:10.1016/j.jcrysgro.2014.04.026

Cited by 37 publications

(1 citation statement)

References 32 publications

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“…With the continuous exploration of organic nonlinear materials, researchers found that the crystals of the chalcone system have the characteristics of high transparency, large laser damage threshold, good crystallinity, high nonlinear absorption coefficient, and extinction coefficient, and are of great research value. − The chalcone molecule has a large π-conjugated system and thus has a long charge transfer axis, and the intramolecular charge can be rapidly transferred from the donor to the acceptor, resulting in a large second harmonic generation (SHG) efficiency, , is the focus of current research. In order to obtain chalcone crystals with large nonlinear coefficients, the introduction of strong electron donors and acceptors is an effective design method. − Since halogen atoms have strong electron-withdrawing and electron-donating effects at the same time, multiple secondary bonds can be formed in the molecule, which can effectively induce the arrangement of the crystal structure and produce a large first-order super conversion rate. − Therefore, it is very valuable to design new second-order nonlinear crystals by introducing halogen elements in the donor.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Spatial Arrangement and Optical Nonlinearity of Chalcone Crystals by Halogen Substituted Donor Groups

Wang

et al. 2023

Crystal Growth & Design

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Controlling the molecular arrangement by introducing halogen element substituents is a very effective crystal design method. Therefore, four chalcone derivatives, EFDAN, ECDAN, EBDAN, and EIDAN, were synthesized by introducing F, Cl, Br, and I, respectively. The tunable crystals containing Cl and Br elements with appropriate size have a better spatial arrangement, which is conducive to the increase of nonlinearity. Theoretical calculations indicate that electron transfer from the amino group and the adjacent benzene ring to the conjugated bridge is the main contributor to the crystal nonlinearity. Meanwhile, all four crystals have higher transparency, greater thermal stability, and lower dielectric constant. This work realizes the control of crystal structure through the rational replacement of halogen elements and provides a feasible idea for the design of other organic nonlinear materials.

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