High-Performance Green Light-Emitting Diodes Based on MAPbBr₃-Polymer Composite Films Prepared by Gas-Assisted...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Perovskite film morphology critically influences the performance of perovskite light-emitting diodes (PeLEDs).
• Achieving uniform and high-quality perovskite films is essential for efficient light emission and device stability.

Purpose of the Study:

• To develop a method for obtaining highly uniform methylammonium lead tribromide (MAPbBr3) films.
• To investigate the impact of a polymer matrix on MAPbBr3 film morphology and optical properties.
• To evaluate the performance of PeLEDs fabricated with the modified perovskite films.

Main Methods:

• A gas-assisted crystallization method was employed using a mixed solution of MAPbBr3 precursor and a polymer matrix.
• Ultrafast solvent evaporation induced high supersaturation, promoting rapid nucleation and formation of a composite film.
• Characterization of the MAPbBr3-polymer composite film's morphology, optical properties, and device performance.

Main Results:

• The gas-assisted method produced MAPbBr3-polymer composite films with full surface coverage and nano-sized grains.
• The polymer matrix significantly altered the optical properties and morphology of the MAPbBr3 films.
• The resulting PeLEDs achieved a maximum luminance of 6800 cd·m⁻² and a current efficiency of 1.12 cd·A⁻¹.
• A 1 cm² PeLED pixel demonstrated uniform, strong green electroluminescence.

Conclusions:

• The developed gas-assisted crystallization method is effective in creating high-quality MAPbBr3 films with desirable morphology.
• The incorporation of a polymer matrix enhances film uniformity and optoelectronic performance of PeLEDs.
• These findings suggest the potential for using these high-quality perovskite films in large-area optoelectronic devices and displays.