Mn(II)-Activated Zero-Dimensional Zinc(II)-Based Metal Halide Hybrids with Near-Unity Photoluminescence Quantum...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Optoelectronics

Background:

• Low-dimensional metal halides are gaining attention as alternatives to perovskites.
• Zinc-based metal halides offer lead-free, low-toxicity, and stable properties but suffer from poor optical performance.
• Developing efficient zinc-based materials is crucial for practical optoelectronic applications.

Purpose of the Study:

• To synthesize and characterize a novel organic-inorganic hybrid zero-dimensional zinc bromide, (TDMP)ZnBr4.
• To enhance the optical properties of (TDMP)ZnBr4 by doping with transition metal Mn2+ ions.
• To investigate the origin of luminescence and the factors contributing to high photoluminescence quantum yield (PLQY).

Main Methods:

• Synthesis of Mn2+-doped (TDMP)ZnBr4.
• Photoluminescence (PL) spectroscopy to determine emission properties (peak position, PLQY).
• Photophysical characterization and theoretical calculations to understand the emission mechanism.

Main Results:

• The synthesized Mn2+-doped (TDMP)ZnBr4 exhibits bright green emission at 538 nm under UV excitation.
• Achieved a high photoluminescence quantum yield (PLQY) of up to 91.2%.
• Confirmed that the green emission originates from the 4T1 → 6A1 optical transition of Mn2+ ions, facilitated by the zero-dimensional host structure.

Conclusions:

• Doping with Mn2+ ions effectively transforms the non-emissive (TDMP)ZnBr4 into a highly luminescent material.
• The zero-dimensional structure of (TDMP)ZnBr4 contributes to highly localized electrons, enhancing PLQY.
• This study provides a pathway for developing advanced zinc-based metal halides with tunable optical properties through ion doping.