Efficient green light-emitting diodes based on quasi-two-dimensional composition and phase engineered perovskite with...

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Physics

Background:

• Perovskite light-emitting diodes (LEDs) exhibit high efficiency and narrow emission spectra.
• Quasi-two-dimensional perovskites, structured with Ruddlesden-Popper layers, offer enhanced exciton binding energy and charge carrier confinement, making them promising for efficient LEDs.
• Phase impurities and surface/grain boundary defects in quasi-two-dimensional perovskites limit their emission efficiency.

Purpose of the Study:

• To engineer optimal quasi-two-dimensional perovskite materials for efficient LEDs.
• To mitigate efficiency losses caused by phase impurities and defects.
• To enhance the performance of green perovskite LEDs through surface passivation.

Main Methods:

• Composition and phase engineering to select optimal quasi-two-dimensional perovskite formulations.
• Surface passivation using the organic small molecule trioctylphosphine oxide (TOPO).
• Fabrication and characterization of green LEDs based on the engineered perovskite films.

Main Results:

• Achieved a current efficiency of 62.4 cd A⁻¹ for green LEDs.
• Reached an external quantum efficiency of 14.36% for the developed perovskite LEDs.
• Demonstrated the effectiveness of TOPO passivation in reducing defects and improving light emission.

Conclusions:

• Optimized quasi-two-dimensional perovskites, combined with surface passivation, significantly boost LED performance.
• The developed strategy overcomes key limitations in perovskite LED efficiency.
• This work presents a viable pathway for high-performance perovskite-based optoelectronic devices.