Effect of isopropanol doped Poly(3,4-ethylene dioxythiophene): poly(styrenesulfonate) on emission characteristics of organic light emitting diodes

The performance of polymer based organic light-emitting devices (OLEDs) that contained isopropanol (IPA) doped poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) utilized as positive charge carriers (hole) injecting electrode were investigated. In this study, morphological changes in PEDOT:PSS thin films have been analyzed with atomic force microscopy (AFM). The results of device performance  with doped PEDOT:PSS were compared with the result of  non doped PEDOT:PSS device. Fabricated OLED with the concentration 1:1 (PEDOT:PSS to IPA)  shows the best performance among the others with almost 8000 cd/m2 brightness and 1.75 cd/A efficiency. Additionally, effect of IPA doping mechanisms proposed in the literature have been surveyed.