Downscaling micro- and nano-perovskite LEDs

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Downscaling electronic devices is crucial for technological advancement.
• Micro-light-emitting diodes (LEDs) based on III-V semiconductors are advanced display technologies but face cost and efficiency challenges at small pixel sizes.
• Perovskite semiconductors offer a promising alternative for next-generation LEDs.

Purpose of the Study:

• To demonstrate the downscaling of perovskite LEDs (PeLEDs) beyond conventional size limits.
• To investigate the efficiency and scalability of micro- and nano-PeLEDs.
• To overcome the efficiency losses observed in traditional micro-LEDs at reduced pixel sizes.

Main Methods:

• Developed a localized contact fabrication scheme for micro- and nano-perovskite LEDs (micro-PeLEDs/nano-PeLEDs).
• Fabricated micro-PeLEDs and nano-PeLEDs with pixel lengths ranging from hundreds of micrometers down to approximately 90 nanometers.
• Prevented non-radiative losses at pixel boundaries through the localized contact method.

Main Results:

• Demonstrated micro-PeLEDs and nano-PeLEDs with characteristic pixel lengths down to about 90 nm, the smallest reported LEDs.
• Achieved sustained external quantum efficiencies (EQEs) of around 20% for near-infrared and green micro-PeLEDs across a wide range of pixel sizes (650 μm to 3.5 μm).
• Enabled a record-high pixel density of 127,000 pixels per inch (PPI) with the developed nano-PeLEDs.

Conclusions:

• Micro- and nano-PeLEDs overcome the efficiency limitations of traditional micro-LEDs at small scales.
• Perovskite-based LEDs offer unprecedented compactness and scalability for future light-source applications.
• This technology represents a significant advancement for next-generation displays and optoelectronic devices.