Molecular organic light-emitting diodes using highly conducting polymers as anodes

Abstract

Films fabricated from commercially available poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) aqueous dispersions have been widely used in many electronic and optoelectronic applications. Previous attempts to utilize them as anodes in organic light-emitting diodes (OLEDs) were not satisfactory due to their low conductivity. In this letter we report on the fabrication and characterization of an OLED device made using a highly conductive form of PEDOT:PSS as anode and demonstrate its superior performance relative to that of a similar device using the commercial conducting polymer as an anode. An external electroluminescence quantum efficiency of ∼0.73% was measured at 100 A/m2.

Recovery and characterization of pure poly(3,4‐ethylenedioxythiophene) via biomimetic template polymerization

“…To investigate the possible applicability of pure PEDOT without silica template to optical and electronic devices such as polymer light-emitting diodes (PLEDs) and photovoltaic cell (PVs) [27][28][29][30], the fluorescence spectra of pure PEDOT (without charged silica template) in DMSO solution (ca. 10 À5 M) were measured with a spectrofluorometer.…”

Transverse charge transport in inkjet printed poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)

“…PEDOT:PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate) is a popular conductive polymer, used as a hole transport layer in organic photovoltaics (OPVs) and organic light emitting diodes (OLEDs) [1][2][3][4][5][6] given its high workfunction, reaching 5.2 eV, and high conductivity, reaching 130 S cm -1 in in-plane charge transport [7][8][9]. In all such applications, conduction takes place in the transverse, z, direction while the value of the workfunction of each conductive layer or active material is most important to maintain the continuous charge flow in the electron and hole transport, respectively.…”

Directly patternable, highly conducting polymers for broad applications in organic electronics

“…Polymer acid templated conducting polymers thus frequently exhibit electrical conductivities (<1 S∕cm) that are several orders of magnitude lower than those of small-molecule acid doped systems. When these polymers are incorporated as electrodes in organic thin-film transistors (OTFTs) (7,8), or as anodes in organic solar cells (OSCs) (9,10) and light-emitting diodes (OLEDs) (11,12), the bulk resistance of the conducting polymers severely limits device performance.…”