Organic Light-Emitting Diodes with Electrospun Electrodes for Double-Side Emissions

Abstract

Transparent conductive electrodes (TCE) obtained by the electrospinning method and gold covered were used as cathodes in the organic light-emitting diodes (OLEDs) to create double side-emission. The electro-active nanofibers of poly(methyl methacrylate) (PMMA) with diameters in the range of several hundreds of nanometers, were prepared through the electrospinning method. The nanofibers were coated with gold by sputtering deposition, maintaining optimal transparency and conductivity to increase the electroluminescence on both electrodes. Optical, structural, and electrical measurements of the as-prepared transparent electrodes have shown good transparency and higher electrical conductivity. In this study, two types of OLEDs consisting of indium tin oxide (ITO)/ poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT-PSS)/ Ir(III) complex (8-hydroxyquinolinat bis(2-phenylpyridyl) iridium–IrQ(ppy)2 20 wt% embedded in N, N′-Dicarbazolyl-4,4′-biphenyl (CBP) sandwich structure and either gold-covered PMMA electrospun nanoweb (OLED with electrospun cathode) were fabricated together with a similar structure containing thin film gold cathodes (OLED with thin film cathode). The luminance-current-voltage characteristics, the capacitance-voltage, and the electroluminescence properties of these OLEDs were investigated.

Highly Transparent Red Organic Light-Emitting Diodes with AZO/Ag/AZO Multilayer Electrode

“…The red Bebq 2 -doped Ir(piq) 3 8 wt.% EML is also used as the ETL, because Bebq 2 has a sufficient energy level to use the ETL. The thickness of 12 nm Mg:Ag is used, which offers sufficient sheet resistance for the cathode [ 28 ]. Finally, the MoO 3 CPL is deposited in the optimum thickness condition, as simulated.…”

Organic Light Emitting Diodes (Oled)

“…b) For the second generation of OLED based on the iridium heavy metal ions, the dual emission IrQ(ppy)2 organometallic compound was used in the active layer of a sandwich structure based on glass/ITO/PEDOT: PSS for the anode. The hole transport layer and a transparent cathode ensure a double-side emission, based on PMMA nanowires and gold deposition (figure 1b) [19].…”