Eastman-kodak Company

Other

Global Oled Technology LLC

Pranab K Raychaudhuri

Joseph K Madathil

Fridrich Vazan

Yuan-Sheng Tyan

Ching W Tang

Liang-Sheng Liao

George R Olin

Tukaram K Hatwar

Joel D Shore

Kee-Chuan Pan

Liang S Hung

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

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 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 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 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.

High contrast light-emitting diode devices

An OLED device, including a substrate, an anode formed of a conductive material over the substrate, an emissive layer having an electroluminescent material provided over the anode layer, a buffer structure including at least two layers, a first buffer layer provided over the electron-transport layer and containing an alkaline halide and a second buffer layer provided over the first buffer layer and containing a metal or metal alloy and having a work function of between 2.0 to 4.0 eV; and a sputtered layer of a metal or metal alloy provided over the buffer structure.

Inorganic buffer structure for organic light-emitting diode devices

An organic light-emitting device including a substrate; an anode disposed over the substrate; an organic light-emitting structure disposed over the anode; a cathode buffer layer disposed over the organic light-emitting structure and of a material selected to permit high energy deposition of a cathode; a cathode disposed over the cathode buffer layer; and an interfacial layer provided with an electron-injecting material between the organic light-emitting structure and the cathode buffer layer.

Electron-injecting layer providing a modified interface between an organic light-emitting structure and a cathode buffer layer

Recordable optical element using low absorption materials

A recordable element includes a substrate, an optical recording layer deposited on the substrate, a light reflecting layer deposited over the recording layer and an interfacial layer having a thickness in a range of 3 to 30 nm and interposed between the recording layer and the reflective layer, the optical recording layer containing Te.sub.a Ge.sub.b C.sub.c H.sub.d O.sub.e where a, b, c, d, and e are the atomic percents such that a+b+c+d+e=100, and wherein 10&lt;a&lt;40, 10&lt;b&lt;60, 5&lt;c&lt;35, 10&lt;d&lt;35, e.gtoreq.0; and the interfacial layer containing Ge.sub.w C.sub.x H.sub.y O.sub.z where w, x, y, and z are atomic percents such that w+x+y+z=100, and wherein 15&lt;w&lt;65, 5&lt;x&lt;35, 15&lt;y&lt;40, z.gtoreq.0. The recording element has its properties changed by heat treatment for a time and temperature selected so as to improve and stabilize its performance.

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Rochester, NY, United States of America

Pranab K Raychaudhuri