27 August 2009 Large area ITO-free flexible white OLEDs with Orgacon PEDOT:PSS and printed metal shunting lines
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Abstract
We demonstrate the feasibility of white organic light-emitting diodes that exclude the transparent conductor indium-tinoxide. Instead, a highly conductive OrgaconTM PEDOT:PSS material in combination with a metal support structure is used as transparent anode and hole-injection layer. The PEDOT:PSS exhibits a conductivity of 460±20 S/cm and a work function of 5.35±0.05 eV. On ITO-free OLEDs on glass with an active area of ~6 cm2 the inclusion of 120 nm thick printed metal lines reduces the variation in brightness from 35% to 20%. The ITO-free concept based on PEDOT:PSS with printed metal structures is scaled up to large flexible OLEDs with a size of 150 cm2 on a heat-stabilized Teonex® Polyethylene Naphtalate foil. The voltage distribution across the various electrodes was verified by a finite element model, allowing a prediction of the OLED brightness and homogeneity over large areas.
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Stephan Harkema, Stephan Harkema, Sibe Mennema, Sibe Mennema, Marco Barink, Marco Barink, Harmen Rooms, Harmen Rooms, Joanne S. Wilson, Joanne S. Wilson, Ton van Mol, Ton van Mol, Dirk Bollen, Dirk Bollen, } "Large area ITO-free flexible white OLEDs with Orgacon PEDOT:PSS and printed metal shunting lines", Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74150T (27 August 2009); doi: 10.1117/12.825246; https://doi.org/10.1117/12.825246
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