Nanowire array electrode structure for organic light-emitting diodes.

Abstract

Organic light emitting diodes were fabricated using a novel electrode structure. The anode structure comprised of a metallic nanowire array and was fabricated by electroplating porous aluminium oxide with copper. These devices were compared with devices with a conventional planar anode structure. The light emitting polymer Poly[(4-methylphenyl) imino-4,4'-diphenylene-(4-methylphenyl)imino-1,4-phenylene-ethenylene-2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-ethenylene-1,4-phenylene)] was used as the emissive material in single layer devices of structure Cu: TPD(4M)-MEH-PPV: Al, where the aluminium was negatively biased with respect to the copper. The DC currentvoltage characteristics of both device types are presented. The electroluminescence spectra are also presented. We found that due to the reduction in active area in the nanowire device from that of the planar device the current density reached in the nanowire array anode device exceeded that in the planar anode device by a factor of eight. Similarly a relative increase in the electroluminescence intensity was also observed.

Polyol Synthesis of Silver Nanowires: An Extensive Parametric Study

“…During the past decades, one-dimensional (1D) metallic nanostructures have received a lot of attention due to their different electrical, optical, magnetic, and thermal properties as compared to their bulk counterparts. Moreover, these 1D metallic nanostructures have found possible applications in various devices. − Since bulk silver (Ag) has the highest electrical and thermal conductivity among all metals, its 1D structure has received considerable attention. Ag nanowires have been used in various applications such as catalysis, surface-enhanced Raman scattering (SERS), , photonic crystals, microelectronics, and biological nanosensors .…”

Nanostructured metal filled porous alumina as an anode in polymer light-emitting diodes

“…The solid state absorption and photoluminescence peaks of this material are 432 nm and 544 nm respectively and the spectra are published elsewhere 5 . This material has exhibited amplification of spontaneous emission in waveguide geometries under pico-second excitation 6 for neat films.…”