Characteristics of organic electroluminescent devices using polypyrrole conducting layer

• Published in: Synthetic metals Vol. 117; no. 1; pp. 119 - 122
• Main Authors: Park, Jong-Wook, Lee, Jun-Young, Kho, Sam-Ill, Lee, Ho-Sik, Kim, Tae-Wan
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.02.2001; Amsterdam Elsevier Science; New York, NY
• Subjects: Application fields; Applied sciences; Electroluminescence; Electronics; Exact sciences and technology; ITO roughness; Optoelectronic devices; PECCP; Polymer industry, paints, wood; Polypyrrole; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Technology of polymers; ITO roughness; Electroluminescence; PECCP; Polypyrrole; Phenylene derivative copolymer; Pyridine derivative polymer; Voltage current curve; Carbazole derivative copolymer; Use; Experimental study; Functional polymer; Conducting polymers; Polyelectrolyte; Acetylene polymer; Conjugated copolymer; Electroluminescent device; Microroughness; Acetylene derivative polymer; Pyrrole polymer
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/S0379-6779(00)00550-6

We observed EL properties based on PVK, poly(3,6- N-2-ethylhexyl carbazolyl cyanoterephthalidene) (PECCP) and Alq3 emitting material devices with doped PPy conducting layer (>5 S/cm) and undoped polyacetylene derivative layer (PEPB, 10 −10–10 −11 S/cm) on top of rough ITO (surface resistance: less than 7 Ω/□). PPy conducting layer improved an EL efficiency of ITO/TPD/Alq3/Al device, which has a rough ITO surface of more than 1000 Å peak to peak level. In PVK, PECCP EML device, when PPy is layered on top of ITO, the turn-on voltage is lowered from 13 to 10 V and from 15 to 9 V, respectively. The conductivity of undoped PEPB film is too low to improve EL property though it has good smoothness.