Investigation of optical and structural stability of localized surface plasmon mediated light-emitting diodes by Ag and Ag/SiO 2 nanoparticles

Lee Woon Jang, Dae Woo Jeon, Myoung Kim, Ju Won Jeon, Alexander Y. Polyakov, Jin Woo Ju, Seung Jae Lee, Jong Hyeob Baek, Jin Kyu Yang, In Hwan Lee

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Localized surface plasmon (LSP) effects due to Ag and Ag/SiO 2 nanoparticles (NPs) deposited on GaN/InGaN multiquantum well (MQW) light-emitting diode (LED) structures are studied. The colloidal NPs are synthesized by a sol-gel method and drop-cased on the LED structures. The surface density of NPs its controlled by the concentration of the NP solution. Theoretical modeling is performed for the emission spectrum and the electric field distribution of LSP resonance for Ag/SiO 2 NPs. Enhanced photoluminescence (PL) efficiency is observed in the LED structures and the amount of PL enhancement increases with increasing the surface density of Ag and Ag/SiO 2 NPs. These effects are attributed to resonance coupling between the MQW and LSP in the NPs. It is also shown that the PL enhancement attainable with Ag NPs and Ag/SiO 2 NPs is comparable, but the latter displays a much higher stability with respect to long-term storage and annealing due to a barrier for NP agglomeration, Ag oxidation, and impurity diffusion provided by the SiO 2 shell.

Original languageEnglish
Pages (from-to)2728-2734
Number of pages7
JournalAdvanced Functional Materials
Volume22
Issue number13
DOIs
Publication statusPublished - 2012 Jul 10
Externally publishedYes

Keywords

  • Ag/SiO nanoparticles
  • light-emitting diodes
  • localized surface plasmons
  • quantum efficiencies
  • silver nanoparticles

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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