Methylpiperazine based 0D chiral hybrid lead halides for second harmonic generation

Hybrid organic-inorganic metal halides (HOMHs) have recently attracted broad research interest for their structural tunability and remarkable optoelectronic properties. Among them, chiral HOMHs have demonstrated promising applications in second-order nonlinear optics (NLO) on account of their inherent noncentrosymmetric structures. Herein, we synthesized two new chiral HOMHs, (S-/R-2-C5H14N2)(2)PbI6, based on S-/R-2-methylpiperazine chiral amines. They feature a band gap close to 2.9 eV with high phase purity as well as environmental and thermal stability. The induction of the chiral optical properties of (S-/R-2-C5H14N2)(2)PbI6 by chiral organic cations was verified by circular dichroism (CD) spectroscopy. Moreover, the resulted HOMHs materials demonstrate a strong second harmonic generation response with a large laser damage threshold (similar to 2.97 mJ cm(-2)), showing promising applications in NLO photonic devices.

Automated summary

Hybrid organic-inorganic metal halides (HOMHs) with tunable structures and remarkable optoelectronic properties have attracted significant research interest. Chiral HOMHs, in particular, have shown promising applications in second-order nonlinear optics (NLO) due to their inherent noncentrosymmetric structures. In this study, we synthesized two new chiral HOMHs, (S-/R-2-C5H14N2)(2)PbI6, using chiral amines derived from S-/R-2-methylpiperazine. These compounds exhibit a band gap close to 2.9 eV and possess high phase purity as well as environmental and thermal stability. Circular dichroism (CD) spectroscopy confirmed the chiral optical properties induced by the chiral organic cations in (S-/R-2-C5H14N2)(2)PbI6. Moreover, these HOMHs materials demonstrated a strong second harmonic generation response with a large laser damage threshold (about 2.97 mJ cm(-2)), thus showing promising potential for applications in NLO photonic devices.