Year: 2026
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Microlight-emitting diodes (micro-LEDs) exhibit high brightness, low power consumption, and fast response, making them highly promising for next-generation displays and optical communication. However, conventional planar encapsulation limits the light extraction efficiency (LEE) and emission directionality, constraining overall luminous performance. Here, we propose a mask-free synchronous-alignment microlens transfer-printing technique capable of packaging thousands to tens of thousands of pixels simultaneously. At a drive current density of 100 A cm –2, the forward luminance increases from 6.5 to 9.6 Mcd m –2 (+48%) and the external quantum efficiency (EQE) increases from 19% to 29% (+53%) compared to planar packaging. To reach a target luminance of 10 Mcd m –2, the required drive current density is reduced by ∼45%. Angular measurements show the emission range expanding from 60°–120° to about 30°–150°, with significantly enhanced on-axis output. Overall, this technique combines high alignment precision and yield with significant LEE/EQE gains, tunable directionality, and lower drive currents, making it viable for mass-produced applications such as visible light communication (VLC), copackaged optics (CPO), and high-density microdisplays.
Source: ACS Applied Optical Materials
Institution: National Tsing Hua University
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W7126256165