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Ohyoung Kim

Ohyoung Kim

Dankook University, Korea

Title: Scattering fibromyalgia and plasmonic and chronic phenomena pain of nanoparticle self-assembled arrays in the thin-film organic lighting devices and photovoltaics

Biography

Biography: Ohyoung Kim

Abstract

The approach using localized surface plasmon resonance (LSPR) from metallic nanoparticles is attractive as one of the promising method to enhance the internal quantum efficiency of an organic light emitting diode (OLED) or power conversion efficiency of an organic solar cell (OSC), where the various shapes and geometrical arrangements of the nanoparticle and the nanostructures affects their performances. LSPR increases electromagnetic density of states which contribute to more efficient light emission of OLEDs. In order to investigate the light extraction from metallic nanoparticle array, we have compared the monodispersed silver nanoparticles (randomly dispersed onto substrates by spin-coating) with the ordered gold metallic arrays (formed by the phase separation of block copolymer; BCP). Gold nanoparticles arrays were given a particular morphology, which is driven by self-assembly of polystyrene-block-poly(2-vinyl pyridine) BCP thin film by solvent-annealing process. Controlling the annealing time and solvent type of the block copolymer results in the various nano-morphologies. In case of OLED, light emission efficiency (internal quantum yield) shows notable improvement (about 43.8%) in terms of current efficiency for line patterns of Au nanoparticles array developed by BCP self assembly. Those plasmonic nanostructures of gold were almost similar scales of BCP patterns, formed at the on the surface of anode (ITO) at both OLED and OSC, showing notable enhancements of the light extraction and power conversion efficiency. The size and the anisotropy of gold nano-patterns were changed from a simple dispersion of dot through an integrated dot-line pattern, finally to a contour line pattern with higher percolation of particle array.

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