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Serially-connected organic light emitting diode stack having conductors sandwiching each light emitting layer

  • US 6,337,492 B1
  • Filed: 05/08/1998
  • Issued: 01/08/2002
  • Est. Priority Date: 07/11/1997
  • Status: Expired due to Term
First Claim
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1. A light emitting device comprising:

  • a substrate having a surface;

    a stack of organic light emitting devices comprising at least a first organic light emitting device and an uppermost organic light emitting device, wherein each organic light emitting device comprises;

    a first conductor layer having an upper and a lower surface, an OLED layer comprising at least one organic layer and having an upper and a lower surface, wherein the lower surface of the OLED layer is in contact with the upper surface of the first conductor layer, and a second conductor layer having an upper surface and a lower surface, wherein the lower surface of the second conductor layer is in contact with the upper surface of the OLED layer, wherein the lower surface of the first conductor layer of the first organic light emitting device is in contact with the surface of the substrate, and wherein the lower surface of the first conductor of each subsequent organic light emitting device is in contact with the upper surface of the second conductor of an organic light emitting device directly below it in the stack; and

    a direct current source for supplying current to the stack of organic light emitting devices wherein the current source applies a voltage between the first conductor layer of the first organic light emitting device and the second conductor layer of the uppermost organic light emitting device with the electrical circuit being completed by an electrical current flowing directly through the stack.

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