Localized surface plasmon enhanced InGaN-based light-emitting diodes with polygonal Au/Al nanoparticles

TL;DR

This paper demonstrates that embedding polygonal Au/Al nanoparticles in nanoholes on InGaN-based LEDs significantly enhances light output by leveraging localized surface plasmon effects, achieving a 46% increase in efficiency.

Contribution

The study introduces a novel fabrication method of polygonal nanoholes with embedded Au/Al nanoparticles to enhance LED performance via localized surface plasmon coupling.

Findings

Light output increased by 46% at higher current injection.

Maximum enhancement factor of 2.38 when reducing coupling distance from 60 nm to 30 nm.

LSP coupling causes a shift in the gain peak to the LSP resonance energy.

Abstract

Localized surface plasmons (LSPs) have played a significant role in improving the light emission efficiency of light emitting diodes (LEDs). In this report, polygonal nanoholes have been fabricated in the p-GaN layer of InGaN-based LEDs by using Ni nanoporous film as the etching mask, and then Au/Al metal nanoparticles are embedded in the nanoholes to form the LSP structure. The coupling between the LSP and the LED has been clearly observed. The results show that the light output of the LEDs has been increased by 46% at higher current injection condition, and together with a shift of the gain peak position to the LSP peak resonance energy. As the coupling distance is decreased from 60 nm to 30 nm, the maximum enhancement factor increases to 2.38. The above results indicate that the LSP from the polygonal metal nanoparticles is a kind of very promising structure to enhance the lighting performance of the InGaN-based LEDs.