High-Brightness Perovskite Light-Emitting Diodes Using a Printable Silver Microflake Contact.

Area of Science:

• Materials Science
• Optoelectronics
• Device Fabrication

Background:

• Solution-processed perovskite light-emitting diodes (PeLEDs) face challenges in achieving high efficiency and fabrication yield.
• Pinholes in perovskite layers and unstable organic interlayers hinder device performance and longevity.

Purpose of the Study:

• To develop a novel fabrication method for high-brightness PeLEDs.
• To address limitations of organic interlayers by introducing a stable inorganic electron-transporting layer.
• To enhance device performance and enable scalable, low-cost manufacturing.

Main Methods:

• Fabrication of a p-i-n PeLED using a novel blade-coated silver microflake (SMF) rear electrode.
• Integration of a nanocrystalline ZnO inorganic electron-transporting layer.
• Characterization of device performance, including luminance, current efficiency, and external quantum efficiency.

Main Results:

• The novel SMF rear electrode prevents electrical shorting, enabling the use of an inorganic electron-transporting layer.
• Achieved a maximum luminance of 98,000 cd/m² and a current efficiency of 22.3 cd/A.
• Demonstrated a high external quantum efficiency of 4.6% at a forward bias of 5.9 V.

Conclusions:

• The SMF rear electrode is crucial for high-performance PeLEDs, offering improved stability and efficiency.
• The developed technology allows for low-cost, scalable, and printable manufacturing of PeLEDs.
• This approach is suitable for flexible device applications, paving the way for advanced display technologies.