12 June 2007 Effect of PEDOT:PSS ratio on the electrical and optical properties of OLEDs
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We report on the employ of several kinds of poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) dispersions as hole injection layer to increase the stability and the charge injection in organic light emitting diodes (OLEDs). The PEDOT:PSS dispersions are different for PEDOT:PSS ratios and their properties were characterized by contact angle measurement, UV-Vis-IR transmittance and I-V characteristics. Multi layer ITO-PEDOT:PSS-PF6-Alq3- Al OLEDs have been manufactured and the electrical and optical properties have been extensively investigated and discussed in function of PEDOT:PSS ratio. We have found that a major quantity of PEDOT induces a decrement of ITO hole barrier and so an increment of OLED current and luminance. Performed transport analysis have pointed out that PEDOT:PSS carrier density ND has a notable role in electrical transport at high bias.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mario Petrosino, Mario Petrosino, Paolo Vacca, Paolo Vacca, Riccardo Miscioscia, Riccardo Miscioscia, Giuseppe Nenna, Giuseppe Nenna, Carla Minarini, Carla Minarini, Alfredo Rubino, Alfredo Rubino, } "Effect of PEDOT:PSS ratio on the electrical and optical properties of OLEDs", Proc. SPIE 6593, Photonic Materials, Devices, and Applications II, 659310 (12 June 2007); doi: 10.1117/12.722022; https://doi.org/10.1117/12.722022

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