Title :
Solution-Processed Flexible ITO-Free Organic Light-Emitting Diodes Using Patterned Polymeric Anodes
Author :
Yim, Younchan ; Park, Jongwoon ; Park, Byoungchoo
Author_Institution :
Nat. Center for Nanoprocess & Equip., Korea Inst. of Ind. Technol., Gwangju, South Korea
fDate :
7/1/2010 12:00:00 AM
Abstract :
We discuss a thin-film spin-coating and patterning process of a conductive polymer electrode for flexible organic light-emitting diodes (OLEDs). For the polymeric anode, dimethylsulfoxide (DMSO)-doped poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has been spin coated on a non-ionic surfactant layer that was pre-coated on the polyethersulfone (PES) substrate. A peel-off method has then been employed to pattern the conductive polymer anode without UV irradiation or heat treatment involved. A peel-off pattern is induced by different adhesion energy among a hydrophobic flexible substrate, a hydrophilic polymeric anode layer, and an adhesive film peeler that is in contact with the polymer anode. With this process technology, we have successfully fabricated solution-processed flexible green OLEDs, showing a peak luminescence of 6000 and a maximum current efficiency of 16.2 cd/A.
Keywords :
anodes; conducting polymers; heat treatment; hydrophilicity; hydrophobicity; organic light emitting diodes; polymer films; spin coating; surfactants; thin films; ultraviolet radiation effects; OLED; UV irradiation; conductive polymer electrode; dimethylsulfoxide; heat treatment; hydrophilic polymeric anode layer; hydrophobic flexible substrate; organic light emitting diode; peel-off patterning method; poly(3,4-ethylenedioxythiophene); poly(styrene sulfonate); polyethersulfone substrate; polymeric anode; spin coating; surfactants; thin film; Anodes; Electrodes; Light emitting diodes; Optical films; Organic light emitting diodes; Organic materials; Polymer films; Rough surfaces; Substrates; Surface roughness; Conductive polymer; flexible organic light-emitting diodes (OLEDs); peel-off patterning method; poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS);
Journal_Title :
Display Technology, Journal of
DOI :
10.1109/JDT.2010.2046718
