Graphdiyne (GDY), as a rising star of all-carbon materials, features high degree π-conjugation, uniformly distributed pores, and an intrinsic natural bandgap. These characteristics guarantee large optical refractive index, low saturation...

The nonlinear optical properties of two-dimensional (2D) layered materials have received extensive attention for their promising application prospects in the field of optoelectronics. Among these materials, 2D carbon materials have been pushed to the research hotspot thanks to their unique chemical and electronic structures. However, the exploration of second harmonic generation (SHG) is currently limited to sp2 hybridized 2D carbon materials, while the research on multi-hybridized carbon atomic materials is relatively rare. Here, we report the observation of optical second harmonic from tetraphenylethylene-graphdiyne (TPE-GDY), a fully conjugated fluorescent 2D material composed of sp and sp2 hybridized carbon atoms based on the tetraphenylethylene (TPE) unit. TPE-GDY is mixed with polyvinylpyrrolidone (PVP) to prepare TPE-GDY/PVP nanocomposite films, which further improves the stability of TPE-GDY. Cotton effect and favorable SHG response have been observed from these composite films. Our research enriches the material system in the field of nonlinear optical effects and opens up broad prospects for functional and potential applications of 2D graphdiyne materials.

Chiral metal halides have shown great potential for applications in next generation nonlinear optics (NLO) devices owing to their intrinsic non-centrosymmetry. However, the structures and properties of chiral hybrid indium...

Recently, low-dimensional hybrid antimony halides have been demonstrated with high performance broadband light emitting behaviors. However, the exploration of nonlinear optical (NLO) properties of these hybrid antimony halides is in its infancy. In particular, the second harmonic generation (SHG) requires a structural noncentrosymmetry, which is challenging but highly desirable for NLO photonic applications. In this work, two pairs of new chiral hybrid antimony halides have been synthesized by combining the organic chiral amine (R/S)-3-aminopiperidine (R/S-3-APD) and the second-order Jahn–Teller cation Sb3+, which crystallize in the noncentrosymmetric P212121 space group in centimeter sizes. NLO characterizations reveal that these hybrid antimony halides exhibit high-efficiency SHG responses with a large laser damage threshold and high birefringence, which provides a guideline for future exploration of new metal halide materials for nonlinear photonic applications.

The striking chemical variability of hybrid organic-inorganic metal halides (HOMHs) accords them fascinating optoelectronic properties. The inorganic skeletons of HOMHs are often flexible and their lattice deformations could serve as...