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Anisotropic Second-Harmonic Generation in Chiral Hybrid Palladium Halides
Xin Qiu1, Junzi Li2, Jiaqi Zhu1
1State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Electronics and Information Engineering, Shenzhen University, Shenzhen, 518060, China.
Angewandte Chemie (International Ed. in English)
|August 5, 2025
Summary
Chiral hybrid palladium halides exhibit unique optical properties. These materials show potential for advanced nonlinear optoelectronic devices due to their significant second-harmonic generation and circular dichroism.
Area of Science:
- Materials Science
- Solid-State Physics
- Optoelectronics
Background:
- Chiral hybrid metal halides (HMHs) are promising for optoelectronic applications.
- Chirality in materials can lead to unique optical phenomena.
- Zero-dimensional (0D) structures offer distinct electronic and optical properties.
Purpose of the Study:
- To synthesize and characterize chiral hybrid metal halides (HMHs).
- To investigate the nonlinear optical (NLO) properties of these materials.
- To explore their potential in advanced optoelectronic devices.
Main Methods:
- Synthesis of zero-dimensional (0D) R/S-methylbenzylammonium)2PdCl4 [(R/S-MBA)2PdCl4] single crystals.
- Characterization of crystal structure and electronic band structure (indirect bandgap, VBM splitting).
- Measurement of second-order nonlinear optical (NLO) coefficients, second-harmonic generation-circular dichroism (SHG-CD), and circularly polarized-SHG (CP-SHG).
Main Results:
- Synthesized chiral (R/S-MBA)2PdCl4 single crystals with an indirect bandgap.
- Observed energy band splitting at the valence band maximum (VBM) due to structural distortion.
- Demonstrated a significant NLO coefficient (15x Y-cut quartz) and notable SHG-CD (gSHG-CD = 0.54).
- Achieved high CP-SHG anisotropy (gCP-SHG up to 0.88) in lead-free HMHs.
Conclusions:
- Chiral hybrid palladium halides possess unique electronic and optical properties.
- The observed NLO effects, including SHG-CD and CP-SHG, are significant.
- These materials show great promise for future nonlinear optoelectronic device applications.
Keywords:
Chiral hybrid palladium halidesCircularly polarized second‐harmonic generationSecond harmonic generation circular dichroismMore Related Videos
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