An organic light-emitting device structure using metal cathode sputtering

Abstract

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.

Description

technical field

[0001] The present invention relates to organic light emitting diode devices and methods of making these devices utilizing an organic buffer layer and a sputtered metal or metal alloy layer on the organic buffer layer. Background technique

[0002] Organic electroluminescence (OEL) devices, or organic light-emitting diodes (OLEDs), are suitable for flat panel display applications. This light-emitting device is attractive because it can be designed to generate red, green and blue colors, has high luminous efficiency, can be operated with low driving voltages in the order of several volts, and is visible at oblique angles. These unique features stem from the basic OLED structure comprising multi-layered thin films of small-molecule organic materials sandwiched between an anode and a cathode. Such structures are disclosed by Tang et al. in commonly assigned US-A-4,769,292 and US-A-4,885,211. Common electroluminescent (EL) media consist of a double-layer struct...

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