Luminescence Patterns on Multimillimeter Single-Crystal MAPbBr₃ Microplatelets via Thermal Ablation Effects.

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Single-crystal perovskites offer excellent optoelectronic properties but suffer from poor light emission due to low recombination rates.
• Excessive carrier diffusion lengths in single crystals hinder efficient light emission.

Purpose of the Study:

• To improve the light-emitting performance of methylammonium lead bromide (MAPbBr3) single crystals.
• To develop a method for enhancing fluorescence intensity and creating patterned light emission.

Main Methods:

• A high-temperature annealing strategy was applied to MAPbBr3 micrometer-thick platelet single crystals (MPSCs).
• Thermal ablation converted surface monocrystalline lattices into polycrystalline perovskite nanocrystals (PNCs).
• Embossing annealing and laser direct writing were used to create fluorescence patterns.

Main Results:

• Fluorescence intensity increased 320-fold due to rapid carrier recombination on the PNC surface.
• The generated PNCs were durable and could be regenerated in situ.
• Complex, high-contrast fluorescence patterns with clear resolution were fabricated.

Conclusions:

• Surface annealing effectively transforms MPSCs into highly emissive PNCs, overcoming limitations of single crystals.
• The developed method allows for controllable, patterned light emission with enhanced intensity and durability.
• This technique holds promise for advanced optoelectronic devices and photonic applications.