Eastman-kodak Company

Global Oled Technology LLC

Joseph K Madathil

Pranab K Raychaudhuri

Ching W Tang

Liang-Sheng Liao

Liang-sun Hung

Kevin P Klubek

Dustin L Comfort

Liang S Hung

Lee William Tutt

Debasis Majumdar

Glen C Irvin, Jr

Robert J Kress

Joel D Shore

Gary S Freedman

Longru Zheng

Liang-Sun Hung

Max G Mason

A method of making a cathode structure for an OLED provided over organic layers includes evaporating a first layer over the organic layers, such layer including a metal or metal alloy whose work function is less that 4.0 eV, or a material including an electron-injecting dopant and a reactive metal; depositing at least one second layer of an inorganic material over the first layer to form a buffer structure with the first layer; and sputtering a protective layer of a metal or metal alloy provided over the buffer structure.

Making a cathode structure for OLEDs

The invention relates to a donor laminate comprising in order, a substrate, an electronically conductive polymer layer in contact with said substrate, and a metal layer.

Metal and electronically conductive polymer transfer

A top-emitting OLED device with improved off-axis viewing includes a substrate; a reflective, substantially opaque, and conductive anode including a metal or metal alloy or both formed over the substrate; at least one organic layer formed over the anode and including an electroluminescent material; a cathode including a semitransparent metallic layer provided over the organic layer wherein the semitransparent metallic layer includes a low reflectivity metal; an light transmissive layer provided over the cathode; and the cathode and light transmissive layer being selected to reduce the color shift with respect to an off-axis viewing angle.

Top-emitting OLED device with improved-off axis viewing performance

In an OLED device, the improvement including a reflective and conductive bilayer anode including a metal or metal alloy or both; a hole-injecting structure over the reflective and conductive bilayer anode; at least one organic layer formed over the hole-injecting structure; and the reflective and conductive bilayer anode being configured to improve the stability of drive voltage.

Organic light emitting device having improved stability

Bottom-emitting organic light-emitting diode device includes a semitransparent, reflective and conductive anode including a metal or metal alloy or both formed over a transparent substrate, a plurality of hole-injecting layers including a bilayer structure having a layer including an oxide and a layer including a fluorinated carbon disposed over the semitransparent, reflective and conductive anode, a plurality of organic layers formed over the plurality of hole-injecting layers and including an emissive layer having an electroluminescent material, and a reflective, opaque and conductive cathode of a metal or metal alloy or both provided over the plurality of organic layers, and the plurality of the hole-injecting layers being configured to reduce the drive voltage, and the transparency of the anode, the reflectivity of the cathode, and the thickness of the organic layers between the electrodes being selected to change the internal reflection of light.

Organic light emitting diode with improved light emission through substrate

Top-emitting organic light-emitting diode devices include a reflective, opaque, and conductive anode layer including a metal or metal alloy or both formed over a transparent or an opaque substrate, a plurality of hole-injecting layers including a bilayer structure having a layer including an oxide and a layer including a fluorinated carbon disposed over the reflective, opaque, and conductive anode, a plurality of organic layers formed over the plurality of hole-injecting layers and including an emissive layer having electroluminescent material and a reflective, semitransparent and conductive cathode include a metal or metal alloy or both provided over the plurality of organic layers, and the plurality of the hole-injecting layers being configured to reduce the drive voltage, and the reflectivity of the anode, the transparency of the cathode, and the thickness of the organic layers between the electrodes being selected to change the internal reflection of light.

Organic light emitting diode with improved light emission through the cathode

A method of making an OLED device capable of emitting light through the top electrode of such device includes providing a substrate and an anode over the substrate; providing an emissive layer disposed over the anode; providing first and second layers over the emissive layer with the first layer being in contact with the emissive layer or electron-transport layer and having a compound that includes an electron-injecting element, and the second layer having a reactive metal, and wherein such reactive metal reacts with the compound to release the electron-injecting element that dopes the interfacial region of the emissive layer or electron-transport layer to improve electron-injection and also reduces the reflectivity of the first and second layers is reduced; and providing a transparent conducting non-metallic top electrode over the second layer.

Highly transparent top electrode for OLED device

An organic electroluminescent device including an anode; a hole-transporting region disposed over the anode; wherein the hole-transporting region contains at least one hole-transporting material; a metal sub-layer disposed within the hole-transporting region; wherein the metal sub-layer contains at least one metal selected from group 4 through group 16 of the Periodic Table of Elements and the selected metal has a work-function higher than 4.0 eV; a light-emitting layer formed in contact with the hole-transporting region for producing light in response to hole-electron recombination; an electron-transporting layer disposed over the light-emitting layer; and a cathode disposed over the electron-transporting layer.

Organic electroluminescent devices having a metal sub-layer within a hole-transporting region

An OLED device, including a substrate, an anode formed of a conductive material disposed over the substrate, an emissive layer having an electroluminescent material provided over the anode layer, a buffer layer, provided over the emissive layer and including phthalocyanine or derivatives thereof, an electron injecting dopant source layer provided over the buffer layer and including a compound of an alkali metal or thermal decomposition products thereof; and a sputtered layer of a metal or metal alloy provided over the buffer layer and selected to function with the buffer layer to inject electrons into the emissive layer.

Organic light-emitting device structure using metal cathode sputtering

An organic electroluminescent device is provided that includes an anode and a substantially pure Mg cathode, an electroluminescent medium disposed between the anode and the cathode, and an adhesion-promoting layer in contact with cathode and the electroluminescent medium. The adhesion-promoting layer comprises at least one metal or metal compound selected from group 1 through group 15 of the Periodic Table of Elements such that the metal has an atomic number of at least 19.

Organic electroluminescent device having an adhesion-promoting layer for use with a magnesium cathode

An organic light-emitting device with improved performance including an anode formed over a substrate; a light-emitting layer formed over the anode for producing light in response to hole-electron recombination; and a performance-enhancing layer formed over the light-emitting layer including one or more chemical reducing materials selected to improve the performance of the organic light-emitting device. The device also includes an electron-transporting layer formed over the performance-enhancing layer, and a cathode formed over the electron-transporting layer.

OLED device with a performance-enhancing layer

An organic electroluminescent device including an anode, an electroluminescent medium, and a metal alloy cathode comprising at least two metals, wherein all the metals of the alloy have their work function higher than 4.0 eV.

High work function metal alloy cathode used in organic electroluminescent devices

An organic light-emitting device includes a substrate, an anode, a cathode, disposed between the anode and the cathode is an electroluminescent medium including, in sequence: a hole-transporting layer; an interface layer; a light-emitting layer; and an electron-transporting layer. The interface layer comprises a compound having an ionization potential greater than that of the organic compound of the hole-transporting layer, and an energy bandgap equal to or greater than that of the organic compound of the light-emitting layer. Wherein the thickness of the interface layer is in the range of 0.1 nm&tilde;5 nm. The interface layer provides more balanced carrier recombination in the light-emitting layer, and achieves higher luminance efficiency.

Organic light-emitting diode having an interface layer between the hole-transporting layer and the light-emitting layer

An OLED device including a substrate, an anode formed of a conductive material over the substrate, and an emissive layer having an electroluminescent material provided over the anode. The OLED device also includes a buffer structure having at least two layers, a first buffer layer provided over the emissive layer and containing an alkaline halide and a second buffer layer provided over the first buffer layer and containing phthalocyanine, and a sputtered cathode layer having an alloy containing an alkaline metal provided over the buffer structure.

Cathode layer in organic light-emitting diode devices

An OLED device including a substrate, an anode formed of a conductive material over the substrate, and an emissive layer having an electroluminescent material provided over the anode. The OLED device also includes either an ultrathin cathode over the emissive layer, a thin interlayer over the ultrathin cathode and a reflecting layer over the thin interlayer, or the thin interlayer over the emissive layer and a reflecting layer containing an electron-injecting dopant over the thin interlayer.

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Rochester, NY, United States of America

Joseph K Madathil