Efficient and High-Conductivity Perovskite LEDs with Low Operating Voltage

Area of Science:

• Materials Science
• Optoelectronics
• Nanoscience

Background:

• Lead halide perovskites offer excellent optoelectronic properties for high-performance LEDs.
• Achieving high luminance at low operating voltages in perovskite LEDs (PeLEDs) is challenging due to limited carrier injection.

Purpose of the Study:

• To present a synergistic strategy for realizing low-voltage, high-efficiency PeLEDs.
• To improve carrier injection and reduce energy loss in PeLED devices.

Main Methods:

• Integration of a phosphonic acid self-assembled monolayer (Br-2PACz), a 3D perovskite emissive film, and a zinc oxide (ZnO) electron transport layer (ETL).
• Utilizing Sulfobetaine 10 (SFB) for regulating perovskite crystallization and reducing trap density.
• Employing Br-2PACz for defect passivation, enhanced hole injection, and electron leakage suppression.

Main Results:

• Optimized PeLEDs demonstrated a low turn-on voltage of 1.9 V.
• Achieved high luminance (39,000 cd m^-2) and external quantum efficiency (EQE) of 22.5%.
• Demonstrated scalability with large-area PeLEDs (1600 mm²) maintaining an 11.2% EQE.

Conclusions:

• The synergistic strategy effectively enables low-voltage operation and high efficiency in PeLEDs.
• The developed method offers a scalable solution for energy-efficient and high-performance perovskite lighting.
• This research advances the development of practical and efficient PeLED technology.