Transparent conductive oxide films embedded with plasmonic nanostructure for light-emitting diode applications

Shih Hao Chuang, Cheng Sheng Tsung, Ching Ho Chen, Sin Liang Ou, Ray-Hua Horng, Cheng Yi Lin, Dong Sing Wuu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

In this study, a spin coating process in which the grating structure comprises an Ag nanoparticle layer coated on a p-GaN top layer of InGaN/GaN light-emitting diode (LED) was developed. Various sizes of plasmonic nanoparticles embedded in a transparent conductive layer were clearly observed after the deposition of indium tin oxide (ITO). The plasmonic nanostructure enhanced the light extraction efficiency of blue LED. Output power was 1.8 times the magnitude of that of conventional LEDs operating at 350 mA, but retained nearly the same current-voltage characteristic. Unlike in previous research on surface-plasmon-enhanced LEDs, the metallic nanoparticles were consistently deposited over the surface area. However, according to microstructural observation, ITO layer mixed with Ag-based nanoparticles was distributed at a distance of approximately 150 nm from the interface of ITO/p-GaN. Device performance can be improved substantially by using the three-dimensional distribution of Ag-based nanoparticles in the transparent conductive layer, which scatters the propagating light randomly and is coupled between the localized surface plasmon and incident light internally trapped in the LED structure through total internal reflection.

Original languageEnglish
Pages (from-to)2546-2553
Number of pages8
JournalACS Applied Materials and Interfaces
Volume7
Issue number4
DOIs
StatePublished - 4 Feb 2015

Keywords

  • light extraction efficiency
  • light-emitting diodes
  • nanoparticles
  • surface plasmons
  • transmission electron microscopy

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