A New Strategy for Organic Optoelectronic Devices

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A New Strategy for Organic Optoelectronic Devices
Heo, Mihee
Kim, Jin Young
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Graduate School of UNIST
My MS research has focused on alternative organic optoelectronic devices as promising technology that may be environmentally friendly renewable energy resources and the next generation flat-panel display platform. During my research, first, high-performance organic optoelectronic devices enhanced by surface plasmon resonance have been demonstrated containing interfacial metal nanoparticles such as copper, gold, and copper-gold alloy between indium tin oxide (ITO) and poly(3,4-ethylenedioxylenethiophene):polystyrene sulfonic acid (PEDOT:PSS) via a polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) copolymer template. In the organic solar cells (OPVs), the improved optical absorption is attributed to the increased electric field in the photoactive layer caused by excited localized surface plasmon from the nanoparticles. Moreover, enhanced luminance intensity and improved luminous efficiency in organic light emitting diodes (OLEDs) are achieved due to the acceleration of the radiative processes at the surface plasmon frequency. A significant effect of the SPR is attained in organic optoelectronic devices, which show up to 20% enhanced performance as compared with reference devices. Second, a rod-coil block copolymer consisting of poly(3-hexylthiophene) (P3HT) and poly(N-vinylcarbazole) (PVK) (P3HT-b-PVK) in a single molecular architecture is prepared as the first example for white light emitting diodes(WOLEDs). By obtaining the phase separated domains in thin film of the resulting block copolymer, it is possible to suppress energy transfer from PVK as wide bandgap units to P3HT as low bandgap blocks, yielding dual emissions for white electroluminescence with CIE coordination of (0.34, 0.33).
Energy Conversion & Storage
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