Achieving strong optical nonlinearity and wide bandgap of pnictides via ionic motif-driven directed assembly of covalent groups.

ABSTRACT: Noncentrosymmetric (NCS) pnictides are indispensable for nonlinear optics, ferroelectrics, magnetic Weyl electronics, etc., areas, yet their structure design remains a substantial challenge. By using asymmetric ionic unit-driven covalent groups orienting and rigidity-flexibility coupling dual strategy, we successfully design and synthesize four NCS pnictides: [Sr₄Br]₂[M^II₃Si₂₅P₄₀] (M^II = Mg, Cd) and [Ba₃Br][M^IIISi₁₀P₁₆] (M^III = Ga, In), which exhibit strong second harmonic generation effects (5.2 to 7.5 × AgGaS₂), wide bandgaps (1.81 to 1.90 electron volts), and moderate birefringence (0.030 to 0.051). An unprecedented NCS structure-inducing mechani

SUBMITTER: Gao L 

PROVIDER: S-EPMC11559624 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature