Development of fin-LEDs for next-generation inorganic displays using face-selective dielectrophoretic assembly

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Devices

Background:

• Micro-light-emitting diodes (LEDs) are crucial for advanced inorganic displays due to their vibrant colors and energy efficiency.
• Challenges in micro-LED adoption include cost-effective chip fabrication and defect-free pixelation.
• Nanorod-LEDs, while utilizing advanced assembly, face limitations in brightness and light extraction.

Purpose of the Study:

• To introduce fin-light-emitting diodes (Fin-LEDs) as an alternative to nanorod-LEDs.
• To enhance brightness and light extraction efficiency in inorganic LEDs.
• To demonstrate the viability of Fin-LEDs for next-generation display technologies.

Main Methods:

• Development of dielectrophoretic-friendly Fin-LEDs.
• Application of face-selective dielectrophoretic assembly technology.
• Fabrication and characterization of blue Fin-LEDs.

Main Results:

• Achieved a wafer utilization ratio exceeding 90%.
• Demonstrated a vertical assembly ratio of 91.3% and a pixel production yield of 99.93%.
• Blue Fin-LEDs reached an external quantum efficiency of 9.1% and a brightness of 8640 cd/m² at 5.0 V.

Conclusions:

• Fin-LEDs offer a viable pathway for high-performance inorganic displays.
• The proposed assembly technology significantly improves key manufacturing and performance metrics.
• Early-stage results indicate Fin-LEDs are competitive with current display technologies.