Enhanced Nonlinear Optical Response and Self-Powered CPL Detection in Unique Triangular-Tetrahedral Chiral Copper(I)...

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Chemistry

Background:

• Low-coordination Cu(I)-based chiral metal halides exhibit significant structural distortions, leading to notable circularly polarized light (CPL) activity and nonlinear optical (NLO) performance.
• A key challenge is achieving highly selective CPL detection with large dissymmetry factors (g_lum) in these materials.

Purpose of the Study:

• To synthesize and characterize 1D chiral (R/S)-MPZCu₂Cl₄ halides with unique structural features.
• To investigate their nonlinear optical properties, including second harmonic generation (SHG) and third harmonic generation (THG).
• To explore their application in self-powered circularly polarized light (CPL) detection and X-ray sensing.

Main Methods:

• Synthesis of 1D chiral (R/S)-MPZCu₂Cl₄ halides.
• Structural analysis to determine the noncentrosymmetric cubic P1₂11 space group and triangular-tetrahedral configuration.
• Measurement of nonlinear optical properties (SHG, THG) and CPL detection capabilities.
• Fabrication and testing of self-powered photodetectors for CPL and X-ray detection.

Main Results:

• The synthesized (R)-MPZCu₂Cl₄ halide demonstrated efficient SHG (7.29 times that of KH₂PO₄) and remarkable THG response.
• A high THG-based CPL detection dissymmetry factor (g_THG-CD) of +0.309 was achieved, marking the first demonstration in Cu(I)-based metal halides.
• Self-powered CPL photodetectors exhibited high CPL distinguishability at 0 V and effective self-powered X-ray detection with low-dose sensitivity and radiation resistance.

Conclusions:

• The unique triangular-tetrahedral structure in (R/S)-MPZCu₂Cl₄ halides drives significant structural distortions, enhancing NLO susceptibility and CPL activity.
• These materials are promising for advanced THG-based CPL detection and multifunctional optoelectronic devices.
• The study provides crucial structure-performance insights for developing next-generation chiral organic-inorganic hybrid Cu(I) halide materials.