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Polymer light emitting diodes (PLEDs) are expected to be commercialized as next generation displays by advantages of the fast response time, low driving voltage and easy manufacturing process for large sized flexible display. Generally, the electrical and optical properties of PLEDs are affected by the surface conditions of transparent electrode. The PLED devices with ITO/PEDOT:PSS/PVK/PFO-poss/LiF/Al structures were prepared by using the spin coating method. For this, PEDOT:PSS(poly(3,4-ethylenedioxythiophene):poly(styrene sulfolnate)) Al 4083 and PVK(N-vinylcabozole) were used as hole injection and transport layers. The PFOposs(poly(9,9-dioctylfluorene)) was used as the emitting layer. The dependence of O₂ plasma treatment of ITO electrode on the electrical and optical properties of PLEDs were investigated. The sheet resistances increased slightly with an improved surface roughness of ITO electrode as the RF power increased during O₂ plasma treatment. The PLED devices prepared on the ITO/Glass substrates, which were plasma-treated at 40 watt in RF power for 30 seconds under 40 mtorr O₂ pressure, showed the maximum external emission efficiency of 0.86 lm/W and the maximum luminance of 250 cd/m², respectively. The CIE color coordinates are ranged X = 0.13~0.18 and Y = 0.10~0.16, showing blue color. emission.

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UCI(KEPA) : I410-ECN-0101-2009-581-014784053