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Large area ITO-free flexible white OLEDs with Orgacon PEDOT:PSS and printed metal shunting lines

2009; SPIE; Volume: 7415; Linguagem: Inglês

10.1117/12.825246

1996-756X

S. Harkema, S. H. Mennema, Marco Barink, Harmen Rooms, Joanne S. Wilson, Ton van Mol, D. Bollen,

Organic Light-Emitting Diodes Research

We demonstrate the feasibility of white organic light-emitting diodes that exclude the transparent conductor indium-tinoxide. Instead, a highly conductive Orgacon TM 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 cm 2 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 cm 2 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.