Stable and bright formamidinium-based perovskite light-emitting diodes with high energy conversion efficiency

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Physics

Background:

• Solution-processable perovskites offer high emission and charge transport for efficient, low-cost light-emitting diodes (LEDs).
• Perovskite LED stability remains a significant challenge despite advances in device efficiency.

Purpose of the Study:

• To develop stable and bright perovskite LEDs with high energy conversion efficiencies.
• To address the critical stability limitations of current perovskite LED technology.

Main Methods:

• Optimization of formamidinium lead iodide films for solution-processable perovskite LEDs.
• Control of precursor solution concentrations to enhance film quality and device performance.

Main Results:

• Achieved 10.7% energy conversion efficiency and 14.2% external quantum efficiency without outcoupling enhancement.
• Demonstrated low efficiency droop (8.3% energy conversion efficiency at 300 mA cm⁻²), outperforming state-of-the-art organic and quantum-dot LEDs at high current densities.
• Reported a half-lifetime of 23.7 hours at 100 mA cm⁻² with benzylamine treatment, comparable to near-infrared organic LEDs.

Conclusions:

• Optimized formamidinium lead iodide films enable stable, high-efficiency perovskite LEDs.
• These findings present a viable pathway for commercializing perovskite-based lighting and display technologies.
• The developed perovskite LEDs show competitive performance against established technologies, especially at high operating current densities.