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Electroluminescence from SiO2 Thin Film Embedded with Self-Assembled Gold Nanoparticles

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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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Keywords: ELECTROLUMINESCENCE; GOLD; NANOPARTICLES; SELF-ASSEMBLE; THIN FILMS

Document Type: Research Article

Publication date: August 1, 2013

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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