Year: 2026
Type: article
Abstract: The micro-structuring of heterostructure layers is an efficient method to enhance the light extraction efficiency of light emitting diodes (LEDs). The light extraction efficiency of micro-pixelated LEDs emitting at 230 nm with arc-shaped mesa sidewalls has been studied by Monte-Carlo ray-tracing simulation and experimentally confirmed by processing LED chips with different pixel diameters. According to simulations, LEDs whose mesa sidewalls are arc-shaped and inclined by 40° show a higher light extraction efficiency than LEDs with a straight inclined mesa sidewall for both transverse-electric and -magnetic polarized light. Experimentally, an eightfold increase in the peak external quantum efficiency was observed for micro-pixelated LEDs with a pixel diameter of 1.5 μm and arc-shaped mesa sidewalls compared to reference LEDs without micro-pixels. With an arc-shaped mesa design, an external quantum efficiency of 1.8% and a wall plug efficiency of 1% were achieved for LEDs emitting at 230 nm.
Source: Journal of Applied Physics
DOI: 10.1063/5.0349842
Institution: Ferdinand-Braun-Institut
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,500
Funder: European Commission
OpenAlex ID: W7221938726