Open AccessEnhanced ultraviolet emission from Au/Ag-nanoparticles@MgO/ZnO heterostructure light-emitting diodes: A combined effect of exciton- and photon- localized surface plasmon couplings
Author(s) -
Cen Zhang,
Haiyang Xu,
Weizhen Liu,
Yang Liu,
J. Zhang,
Lixia Zhang,
Jiang Wang,
Jiangang Ma,
Yichun Liu
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.015565
Subject(s) - materials science , optoelectronics , electroluminescence , heterojunction , light emitting diode , exciton , surface plasmon , ultraviolet , localized surface plasmon , diode , surface plasmon polariton , nanoparticle , quantum efficiency , spontaneous emission , plasmon , optics , laser , layer (electronics) , nanotechnology , physics , quantum mechanics
Localized surface plasmon (LSP)-enhanced ultraviolet light-emitting diodes (LEDs) based on a Au/MgO/ZnO metal/insulator/semi- conductor heterostructure were fabricated by embedding Ag nanoparticles (Ag-NPs) into MgO dielectric layer. A ~6-fold electroluminescence (EL) enhancement was achieved from the Ag-NPs decorated device. Time-resolved spectroscopy studies, as well as analogue simulation and theoretical estimation based on experimental data, reveal that the internal quantum efficiency and light extraction efficiency of the heterojunction LED are increased ~3-fold and ~2-fold, respectively, as a result of the introduction of Ag LSPs. This result indicates that the observed EL enhancement originates from a combined effect of both exciton-LSP coupling and photon-LSP coupling.