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Cascaded organic electroluminescent device having connecting units with N-type and P-type organic layers

  • US 6,936,961 B2
  • Filed: 05/13/2003
  • Issued: 08/30/2005
  • Est. Priority Date: 05/13/2003
  • Status: Active Grant
First Claim
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1. A cascaded organic electroluminescent device comprising:

  • a) an anode;

    b) a cathode;

    c) a plurality of organic electroluminescent units disposed between the anode and the cathode, wherein the organic electroluminescent units comprise at least a hole-transporting layer, an electron-transporting layer, and an electroluminescent zone formed between the hole-transporting layer and the electron-transporting layer wherein the physical spacing between adjacent electroluminescent zones is more than 90 nm; and

    d) a connecting unit disposed between each adjacent organic electroluminescent unit, wherein the connecting unit comprises, in sequence, an n-type doped organic layer and a p-type doped organic layer forming a transparent p-n junction structure wherein the resistivity of each of the doped layers is higher than 10 Ω

    -cm.

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