Organic light-emitting device
An organic light-emitting device is provided, comprising a bottom electrode, at least two emissive units disposed on the bottom electrode, at least one charge-generation layer disposed between two adjacent emissive units, and a top electrode disposed on the emissive units. The charge-generation layer comprises fullerene or a derivative thereof, and generates and transports electrons and holes.
1. An organic light-emitting device, comprising:
a bottom electrode;
at least two emissive units disposed on the bottom electrode;
at least one charge-generation layer comprising fullerene or a derivative thereof, disposed between the at least two emissive units, for generating electrons and holes; and
a top electrode disposed over the emissive units.
2. The organic light-emitting device of claim 1 , wherein the at least one charge-generation layer comprises oligofluorenes or a derivative thereof.
3. The organic light-emitting device of claim 1 , wherein the at least one charge-generation layer comprises terfluorene, (ter(9,9-d diaryfluorene)s), (oligo(9,9-diaryfluorene)s), or a derivative thereof.
4. The organic light-emitting device of claim 1 , wherein the at least one charge-generation layer comprises C60, C70, C90, or a derivative thereof.
5. The organic light-emitting device of claim 1 , wherein each of the at least two emissive units comprises a hole injection layer, an electron injection layer disposed on the hole injection layer, and an emissive layer disposed between the hole injection layer and the electron injection layer.
6. The organic light-emitting device of claim 5 , wherein each of the at least two emissive units further comprises a hole transport layer disposed between the hole injection layer and the emissive layer, and an electron transport layer disposed between the emissive layer and the electron injection layer.
7. The organic light-emitting device of claim 5 , wherein the at least one charge-generation layer has a Lowest Unoccupied Molecular Orbital (LUMO) between a Highest Occupied Molecular Orbital (HOMO) of the hole injection layer and a LUMO of the electron injection layer.
8. The organic light-emitting device of claim 5 , further comprising a buffer layer disposed between the at least one charge-generation layer and the electron injection layer.
9. The organic light-emitting device of claim 8 , wherein the buffer layer has a work function between the LUMO of the at least one charge-generation layer and the LUMO of the electron injection layer.
10. The organic light-emitting device of claim 8 , wherein the buffer layer comprises Al, Ag, Ni, Ti, Ca, Mg, Rb, Ta, or combinations thereof.
11. The organic light-emitting device of claim 5 , wherein the electron injection layer is doped with an n-type dopant.
12. The organic light-emitting device of claim 11 , wherein the n-type dopant comprises metal halide.
13. The organic light-emitting device of claim 11 , wherein the n-type dopant has a concentration ranging from about 1% to about 99% by weight.
14. The organic light-emitting device of claim 5 , wherein the hole injection layer comprises a p-type dopant.
15. The organic light-emitting device of claim 14 , wherein the p-type dopant comprises TF-TCNQ, FeCl3, or a combination thereof.
16. The organic light-emitting device of claim 14 , wherein the p-type dopant has a concentration ranging from about 0.1% to about 50% by weight.
17. The organic light-emitting device of claim 1 , wherein the at least one charge-generation layer has a thickness ranging from about 0.1 to about 100 nm.
18. The organic light-emitting device of claim 1 , wherein the at least two emissive units have the same luminant color.
19. The organic light-emitting device of claim 1 , wherein the at least two emissive units have different luminant colors.
20. The organic light-emitting device of claim 1 , wherein at least one of the bottom electrode and the top electrode comprises a transparent electrode.