Merck Patent Gmbh

Yun Fu Chan

Poopathy Kathirgamanathan

Sivagnanasundram Surendrakumar

Subramaniam Ganeshamurugan

Seenivasagam Ravichandran

In OLEDs, improved efficiency is obtained by compounds which can form inter alia electron injection layers of the formula (I) 

Electroluminescent device using azomethine-lithium-complex as electron injection layer

Electroluminescent devices are disclosed comprising a transparent anode; a layer of a hole transporting material; a layer of an electroluminescent material; a layer of an electron transporting material; a layer of a substituted lithium quinolate; and a metal cathode. The electroluminescent device may be an organic light-emitting diode having a cathode, an electron injection layer in contact with the cathode and an electron transport layer in contact with the electron injection layer and comprising aluminum, zirconium or hafnium quinolate or a mixture thereof or a mixture of any of them with a quinolate of a metal of group 1, 2, 3, 13 or 14 of the periodic table. Such devices may be made by the steps of forming a substituted lithium quinolate having one or more substituents and depositing the substituted lithium quinolate on a cathode of the device to provide an electron injection layer.

Cathode coating

The invention provides new compounds of the formula I, II or III. These compounds can be used as electron transport materials in optical light emitting diodes (OLEDs). The compounds of the formula I, II and III are as follows: 

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Cleveland, United Kingdom

Yun Fu Chan