Effets des résonances plasmon de surface localisé sur les performances optiques et électriques des diodes électroluminescentes organiques

Content Provider	Semantic Scholar
Author	Khadir, Samira
Copyright Year	2016
Abstract	In this work, we report the use of localized surface plasmon (LSP) effect generated by metallic nanoparticles (NPs) to improve the performances of organic light emitting diodes (OLED). We have considered two types of nanoparticles, random metallic NPs (RMN) and periodic metallic NPs (PMN). In order to optimize the NPs parameters to obtain LSPR in the visible spectrum, numerical simulations of the effect of the NPs parameters have been carried out using the FDTD method. In the first part of the experimental work, we focused on the study of silver RMN fabricated by thermal evaporation during the OLED fabrication process. The effects of the size of NPs and their distance from the emitting layer have been studied. For optimal parameters, we showed a 20% enhancement of the efficiency of the OLED with NPs. The insertion of this optimized plasmonic OLED in a half vertical cavity allowed a 2 fold enhancement of the electroluminescence with a spectral narrowing up to 11 nm. In the second part of the experimental work, we considered PMN structures of silver and aluminum fabricated by electron beam lithography on glass/ ITO substrates with precise control of the NPs parameters. After optimization, green and blue μ-OLED have been fabricated on the Al NPs. We showed a 20% enhancement of the efficiency of the μ-OLED with Al NPs in both cases. The EL spectrum of the blue μ-OLED indicates the presence of a peak attributed to the exciplex emission formed between the NPB and CBP that was removed by the incorporation of Al NPs. In addition, despite the fact that the J-V characteristic of the blue μ-OLED is not affected by the Al-NPs, their luminance, thus the number of photons generated, is increased by 25% compared to the OLED without NPs. The Ag NPs have been used to study red OLED. In this case, the hole injection mechanism has been greatly improved which leads to a charge imbalance in the emissive layer inducing a drop of the μ-OLED efficiency.
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Language	English
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Content Type	Text
Resource Type	Article