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

Author: Harkema, S. · Mennema, S. · Barink, M. · Rooms, H.C.A. · Wilsona, J.S. · Mol, A.M.B. van · Bollen, D.
Type:article
Date:2009
Institution: TNO Industrie en Techniek
Source:Organic Light Emitting Materials and Devices XIII, 2 August 2009 through 4 August 2009, San Diego, CA. Conference code: 81432, 7415
series:
Proceedings of SPIE - The International Society for Optical Engineering
Identifier: 409310
ISBN: 9780819477057
Article number: 74150T
Keywords: Electronics · Flexible · ITO-free · Metal grid · OLED · ORGACON PEDOT:PSS · Printed silver · White-emitting · Flexible · ITO-free · Metal grid · OLED · PEDOT:PSS · Printed silver · White-emitting · Finite element method · ITO glass · Light emission · Light emitting diodes · Organic light emitting diodes (OLED) · Silver · Metals

Abstract

We demonstrate the feasibility of white organic light-emitting diodes that exclude the transparent conductor indium-tinoxide. Instead, a highly conductive Orgacon™ 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<sup>2</sup> 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<sup>2</sup> 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. © 2009 SPIE.