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Large area organic electronic devices having conducting polymer buffer layers and methods of making same

a technology of organic electronic devices and buffer layers, which is applied in the direction of discharge tubes/lamp details, discharge tubes luminescnet screens, other domestic articles, etc., can solve the problems of becoming more and more difficult to control the number of defects on the substrate or electrode layer, and achieve the effects of reducing or eliminating performance failures, and reducing imperfections

Inactive Publication Date: 2003-11-13
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] The present invention relates to a method for adding a buffer layer comprising an intrinsically conducting polymer adjacent to an electrode layer in an organic electronic device such as an OLED to increase performance reliability. For example, the buffer layer may be between the anode layer and hole transporting layer. In particular it can improve the performance of OLEDs that rely upon vapor-coated indium tin oxide as an anode. Adding such a buffer layer to an organic electronic device can reduce or eliminate performance failures such as electrical shorts and non-radiative regions (dark spots).

Problems solved by technology

For applications requiring large area displays, it becomes more and more difficult to control the number of defects on a substrate or electrode layer.

Method used

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  • Large area organic electronic devices having conducting polymer buffer layers and methods of making same
  • Large area organic electronic devices having conducting polymer buffer layers and methods of making same

Examples

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example 1

Externally-Doped Polyaniline on Flexible Substrate

[0050] ITO-coated poly(ethylene terephthalate) (PET) was prepared by treating about 7.6 m of 0.125 mm thick PET film, 15.2 cm wide, in a vacuum roll coater using DC planar magnetron sputtering at a pressure of 8.times.10.sup.-3 torr using a sputter gas of 95% argon and 5% oxygen. The ITO sputter target was a 99.99% pure ceramic comprising 90% In.sub.2O.sub.3 and 10% SnO.sub.2, having a density of 90%. Sputtering took place at 280 watts and 350 volts, with a current of 0.80 amperes. The film was processed through the coater at a rate of 16 cm / min. The coated film exhibited a quarterwave reflectance maximum at 550 nm. Sheet resistance of the coated film ranged from 71 to 83 ohm / square.

[0051] The substrate was rinsed with deionized water, dried under a nitrogen stream, then placed in a micro-gravure coater (CAG-150-UV, Yasui Seiki USA Co., Bloomington, Ind.) equipped with a Tn-Helical roller (a Quad roller may alternatively be used) and...

example 2

Coating of Self-Doped Polyaniline on Flexible Substrate

[0053] A flexible ITO-coated PET substrate (Southwall Technologies, Palo Alto, Calif.) measuring approximately 5 cm.times.15 cm was wiped clean with ethyl alcohol on a soft cloth, then soaked for 30 seconds in a metal ion-free developer solution (Shipley 319, Shipley Div. of Rohm and Haas, Marlboro, Mass.), then rinsed with deionized water. The substrate was clamped onto a glass plate in a flexographic ink proofing unit (The Precision Proofer, lo manufactured by Precision Proofing Co., West Monroe, La. and described in U.S. Pat. No. 4,984,532) that was equipped with a two-roll microgravure offset coating head (Precision Hand Proofer, Pamarco, Inc., Roselle, N.J.). A bead of unfiltered water-soluble 75% sulfonated self-doped polyaniline (Aldrich) was placed on the ITO-coated substrate in front of the microgravure roller and a coating of the polyaniline solution was applied to the substrate by moving the roller over the substrate ...

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Abstract

Large area organic electronic devices having a doped conducting polymer buffer layer are described. Methods for applying a doped conducting polymer buffer layer to an electrode-coated large area substrate are described. The methods include web coating techniques such as microgravure coating or meniscus coating, which may be used in continuous coating processes.

Description

[0001] This invention relates to conducting buffer layers for organic electronic devices and in particular for organic light emitting diodes (OLED)s including flexible, large area OLEDs. The invention also relates to methods for applying the buffer layer.[0002] Organic electronic devices are articles that include layers of organic materials, at least one of which can conduct an electric current. An example of an organic electronic device is an organic light emitting diode (OLED). OLEDs, sometimes referred to as lamps, are desirable for use in electronic media because of their thin profile, low weight, and low driving voltage, i.e., less than about 20 volts. OLEDs have potential use in applications such as backlighting of graphics, pixelated displays, and large emissive graphics.[0003] OLEDs typically consist of an organic light emitter layer and additional organic charge transport layers on both sides of the emitter, all of which are sandwiched between two electrodes: a cathode and ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L51/40H05B33/10H01L51/50H05B33/02
CPCH01L51/0004Y10S428/917H01L51/5088H10K71/13H10K50/17H05B33/00
Inventor MCCORMICK, FRED BOYLEVERNSTROM, GEORGE DAVIDHSU, YONGBIRKHOLZ, RUSSELL DEAN
Owner 3M INNOVATIVE PROPERTIES CO
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