Water-Stable Zero-Dimensional (C₄H₉)₄NCuCl₂ Single Crystal with Highly Efficient Broadband Green Emission

Area of Science:

• Materials Science
• Solid-State Chemistry
• Photophysics

Background:

• Metal halide materials are crucial for optoelectronics.
• Developing lead-free and water-stable alternatives remains a challenge.
• Understanding luminescence mechanisms in novel frameworks is essential.

Purpose of the Study:

• To synthesize and characterize novel lead-free metal halide single crystals.
• To investigate the photoluminescence properties and stability of these materials.
• To explore the potential of these materials for anti-water applications.

Main Methods:

• Single crystal synthesis of (C4H9)4NCuCl2.
• Photoluminescence spectroscopy at room temperature and variable temperatures.
• Water soaking tests to assess stability.

Main Results:

• (C4H9)4NCuCl2 exhibits a zero-dimensional framework with isolated [CuCl2]- anions.
• The material shows a broad emission band at 508 nm with high photoluminescence quantum yield (82%).
• Luminescence intensity remains stable after 24 hours of water soaking, demonstrating excellent anti-water stability.

Conclusions:

• (C4H9)4NCuCl2 is a promising lead-free, water-stable luminescent material.
• The self-trapped exciton emission mechanism is responsible for its photoluminescence.
• These findings offer new strategies for designing stable metal halide-based optoelectronic devices.