Enhanced Photoluminescence in Hybrid Manganese Halides via Halogen Regulation for LED Applications

Area of Science:

• Materials Science
• Solid-State Chemistry
• Optoelectronics

Background:

• Organic-inorganic Mn(II)-based halides are attractive for optoelectronic applications due to their tunable properties.
• Enhancing luminescence requires careful selection of organic groups and halogen regulation.

Purpose of the Study:

• Synthesize novel zero-dimensional (C8H18N)2MnX4 (X = Cl, Br) compounds.
• Investigate their luminescence properties, stability, and potential for optoelectronic applications.

Main Methods:

• Synthesis of two new Mn(II)-based halide compounds.
• Characterization of their optical and luminescence properties.
• Theoretical calculations to understand photoluminescence mechanisms.
• Fabrication of LED devices for application demonstration.

Main Results:

• The synthesized compounds (C8H18N)2MnCl4 and (C8H18N)2MnBr4 exhibit bright green emission.
• Photoluminescence quantum yield (PLQY) increased from 33.87% to 81.12% upon replacing Cl- with Br-.
• Both compounds demonstrated high thermal, environmental, and optical stability.
• LED devices fabricated with these materials showed remarkable color stability.

Conclusions:

• The photoluminescence originates from the [MnX4]2- tetrahedra via a 4T1 → 6A1 spin-forbidden transition of Mn2+.
• These novel Mn(II)-based halides are promising for solid-state lighting.
• The study provides an effective strategy for designing high-performance Mn(II)-based halides.