Inverted organic light emitting diode with doped layers
A light emitting component with organic layers, e.g., an organic light-emitting diode, which includes a substrate, at least one light emitting layer, and at least one charge carrier transport layer, having a cathode on the substrate and light emission through the anode. The light emitting component may further include a transport layer that is p-doped with an organic material.
1. An organic light-emitting diode comprising:
a substrate;
at least one light-emitting layer;
at least one charge carrier transport layer;
a bottom electrode namely a cathode at the substrate; and
a top electrode namely an anode wherein light emission is through the anode, wherein the at least one charge carrier transport layer is disposed directly beneath the anode, and is p-doped with an organic material, wherein the p-doped charge carrier transport layer has a layer thickness greater than 100 nm and wherein the substrate, the at least one light emitting layer, the at least one charge carrier transport layer, the cathode and the anode are arranged in an inverted LED structure, and wherein the p-doped charge carrier transport layer has a layer thickness greater than 100 nm to protect the underlying layers from damage in the fabrication of the anode.
2. The organic light-emitting diode according to claim 1 , further comprising a block layer between the charge carrier transport layer and the light-emitting layer.
3. The organic light-emitting diode according to claim 2 , wherein the thickness of the block layer is from about 0.1 nm to about 50.
4. The organic light-emitting diode according to claim 1 , further comprising an electron transport layer between the cathode and the light-emitting layer.
5. The organic light-emitting diode according to claim 4 , further comprising:
a block layer between the electron transport layer and the light-emitting layer, and
an another block layer between the light-emitting layer and the charge carrier transport layer.
6. The organic light-emitting diode according to claim 5 , wherein the electron transport layer is doped.
7. The organic light-emitting diode according to claim 6 , further comprising:
a block layer between the electron transport layer and the light-emitting layer; and
an another block layer between the light-emitting layer and the charge carrier transport layer.
8. The organic light-emitting diode according to claim 4 , further comprising a contact-improving layer between the electron transport layer and the cathode.
9. The organic light-emitting diode according to claim 4 , wherein the electron transport layer is n-doped by mixing an organic main substance and a donor-type doping substance.
10. The organic light-emitting diode according to claim 9 wherein the molar concentration ratio of organic main substance to donor-like doping substance in the electron transport layer is from about 1:100,000 to about 5:1.
11. The organic light-emitting diode according to claim 4 , wherein the thickness of the electron transport layer is from about 0.1 nm to about 50.
12. The organic light-emitting diode according to claim 1 , further comprising a contact-improving layer between the anode and the charge carrier transport layer.
13. The organic light-emitting diode according to claim 1 , wherein the cathode is located on a transparent substrate.
14. The organic light-emitting diode according to claim 1 , wherein the light-emitting layer is a mixed layer of several materials.
15. The organic light-emitting diode according to claim 1 , wherein the charge carrier transport layer comprises an organic main substance and an acceptor-type doping substance.
16. The organic light-emitting diode according to claim 15 wherein the molar concentration ratio of organic main substance to acceptor-like doping substance in the charge carrier transport layer is from about 1:100,000 to about 5:1.
17. The organic light-emitting diode according to claim 1 , wherein the anode is transparent.
18. The organic light-emitting diode according to claim 17 , wherein the anode further comprises a protective layer.
19. The organic light-emitting diode according to claim 1 , wherein the anode is at least semi-transparent.
20. The organic light-emitting diode according to claim 19 , wherein the anode further comprises a protective layer.
21. The organic light-emitting diode according to claim 19 , wherein the at least semi-transparent metallic anode further comprises a transparent contact layer to enhance transverse conduction.
22. The organic light-emitting diode according to claim 1 , wherein the sequences of charge carrier transport layer and anode is repeated several times in one component.
23. The organic light-emitting diode according to claim 1 , wherein the thickness of at least one of the charge carrier transport layer and the light-emitting layer is from about 0.1 nm to about 50.