Light emitting devices utilizing high work function electrodes

Details Light emitting devices utilizing high work function electrodes Light emitting devices utilizing high work function electrodes

1997-07-29

1999-09-21

Patel, Vip

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

313506, 313512, H01J 162

Patent

active

059558342

ABSTRACT:
In general terms the present invention includes light emitting polymeric materials and light emitting devices made therefrom. The present invention also includes light emitting devices incorporating light emitting polymeric materials of the present invention. In general terms, such devices comprise: (a) a substantially transparent cathode comprising a conducting material having a first work function value; the cathode in contact with (b) an electron transporting/hole transporting polymer having an electron affinity value and ionization value; the electron transporting polymer in contact with (c) an anode comprising a conducting material having a second work function value; and the first work function value and the electron affinity being such as to allow the flow of electrons to flow into the electron transporting/hole transporting polymer, and the second work function value and the ionization value being such as to allow a flow of holes from the anode to the electron transporting/hole transporting polymer, so as to cause an electroluminescent emission from the device. Such devices may be bilayer or multilayer devices, in accordance with arrangements known in the art. Likewise, the source of electrical current may be from any appropriate source having the electrical characteristics sufficient to and appropriate for the desired device make-up and application.

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