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Article Abstract
Metal halide borates are promising candidates for high-performance nonlinear optical (NLO) applications, yet the origins of their second harmonic generation (SHG) properties remain unclear. Using atom response theory combined with density functional theory calculations, this study investigates why halogen substitution leads to distinctly different SHG responses in halide monoborates (PbBOX) versus halide pentaborates (PbBOX). We find that the SHG origins vary between these two families due to differences in the strength of the Pb-X interactions. Interestingly, the stereochemically active lone pairs are not shown to be the primary contributors to SHG; instead, these hybridized asymmetric orbitals can introduce negative contributions. Utilizing the vs α/(NE) linear relationship, we predict 12 new NLO borates with strong SHG responses, including the promising NLO material SnBOI (19.2 × KDP), which is expected to exhibit the highest SHG response among halide borates reported to date. This work provides valuable insights into the relationship between elemental substitution and SHG modulation, guiding the design of advanced NLO materials.
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