Multilayer structures as stable hole-injecting electrodes for use in high efficiency organic electronic devices
First Claim
1. A multilayer electrode comprising a first layer having a first layer conductivity, a second layer in contact with the first layer, said second layer comprising a conductive organic material having a second layer conductivity, and a third layer in contact with the second layer, said third layer comprising a conductive organic material having a third layer conductivity greater than the second layer conductivity and less than the first layer conductivity.
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Abstract
Multilayer anode structures (104) for electronic devices (100) such as polymer light-emitting diodes are described. The multilayer anodes include a high conductivity organic layer (114) adjacent to the photoactive layer (102) and a low conductivity organic layer (112) between the high conductivity organic layer and the anode'"'"'s electrical connection layer (110). This anode structure provides polymer light emitting diodes which exhibit high brightness, high efficiency and long operating lifetime. The multilayer anode structure of this invention provides sufficiently high resistivity to avoid cross-talk in passively addressed pixellated polymer emissive displays; the multilayer anode structure of this invention simultaneously provides long lifetime for pixellated polymer emissive displays.
48 Citations
30 Claims
- 1. A multilayer electrode comprising a first layer having a first layer conductivity, a second layer in contact with the first layer, said second layer comprising a conductive organic material having a second layer conductivity, and a third layer in contact with the second layer, said third layer comprising a conductive organic material having a third layer conductivity greater than the second layer conductivity and less than the first layer conductivity.
- 11. An electronic device comprising a photoactive layer between a cathode and an anode, wherein the anode is a multilayer anode including a first anode layer comprising high conductivity transparent inorganic contact layer, a second anode layer adjacent to the first anode layer, said second anode layer comprising conjugated conductive organic polymer and having a low conductivity and a third anode layer between said second anode layer and said photoactive layer, said third anode layer comprising a conductive organic polymer and having a higher conductivity resistance than said second anode layer.
- 20. An array of polymer emissive diodes comprising an active emissive polymer layer having a first side in contact with a patterned cathode and a second side in contact with a patterned transparent anode, the patterning of said anode and cathode defining an array of emissive diodes, wherein a multilayer anode including a first layer comprising a patterned high conductivity inorganic contact layer, a nonpatterned second layer in contact with said first layer, said second layer comprising conjugated conductive organic polymer and having a high resistance and a nonpatterned transparent third layer in contact with said second layer and with said active emissive polymer layer, said third layer comprising a conductive organic polymer and having a lower resistance than said second layer.
Specification