Electroluminescence from SiO2 Thin Film Embedded with Self-Assembled Gold Nanoparticles
Room-temperature visible electroluminescence (EL) peaked at 640 nm (1.94 eV) from SiO2 thin film embedded with self-assembled gold nanoparticles (Au NPs), which are synthesized by electron-beam evaporation followed by rapid thermal annealing (RTA) is observed. Due to the inclusion of the Au NPs, the EL intensity is greatly increased and the EL peak position is red-shifted as compared to the EL of the control sample without Au NPs embedded. It is shown that the presence of Au NPs enhances the current conduction in the SiO2 film, which increases the probability of recombination of the injected electrons and holes at the luminescence centers and thus the EL intensity. In addition, the coupling effect between the excitons in the SiO2 thin film and the induced surface plasmon resonance of the Au NPs can also enhance the light emission. On the other hand, the coupling effect may also be responsible for the red-shift of the EL band position.
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Document Type: Research Article
Publication date: August 1, 2013
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