KyungHo Jung

Novel ionic iodide-siloxane hybrid electrolyte for dye-sensitized solar cells.

A novel ionic siloxane hybrid electrolyte was fabricated by thermal polymerization of iodide-oligosiloxane resin. The nanosized iodide-oligosiloxane was synthesized by a simple sol-gel condensation of 3-iodopropyltrimethoxysilane and diphenylsilanediol. It is found that the composition and concentration of the oligosiloxane used in the electrolyte affect the performance of the dye-sensitized solar cells (DSSCs). An optimized DSSC with the hybrid electrolyte using smaller molecular-sized oligosiloxane with a greater amount of iodide groups presented solar to electricity conversion efficiency of 5.2% at 1 sunlight (100 mW cm(-2)), which is comparable to that afforded by a liquid electrolyte.

Improved lifetime of highly flexible OLEDs based on multilayered transparent electrodes with enhanced barrier performance

— Flexible organic light-emitting diodes (FOLEDs) showing enhanced barrier properties under repeated mechanical stress are reported. By combining metal-based multilayer transparent electrodes (MTEs) as highly flexible anodes replacing ITO electrodes and sol-gel organic-inorganic hybrimers which function as both planarizing films and barrier layers, the proposed FOLEDs not only exhibit a level of performance comparable to that of ITO-based reference devices but also show a superior mechanical flexibility with “after-bending” lifetime close to that of ITO-based devices.

Elliptic cylindrical pseudo-optical black hole for omnidirectional light absorber

An elliptic cylindrical omnidirectional light absorber forming a pseudo-optical black hole is studied both analytically and numerically. The conditions for permittivity tensors to trap optical rays are obtained from semiclassical analysis of the ray optic Hamiltonian. The dispersive finite-difference time-domain method is used to study the performance of these light-absorbing structures numerically. It is found that the permittivity of the structure in the form (1/sinhu u)≥(a/r)n traps the light ray efficiently into the elliptic absorber for n≥2, where u is the radial elliptic coordinate and a is the focal distance.

P‐69: PDP Fabricated with Low‐Temperature Processes Below 300°C Using Sol‐Gel Hybrid Polymers (Hybrimer PDP)

PDP was fabricated using low-temperature processable sol-gel hybrid polymers (hybrimers) as the dielectric and barrier rib materials replacing the glass frits. All the processes including dielectric coating, barrier rib molding fabrication, phosphor printing and sealing were performed at low temperature below 300°C. This new process is easy, simple and cheap to be capable of producing a large PDP with high yield without applying high temperature processes.