12 June 2007 Effect of PEDOT:PSS ratio on the electrical and optical properties of OLEDs
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Abstract
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.
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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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