White light emitting organic electroluminescent device
Provided is a white light emitting organic electroluminescent device, which includes a transparent substrate, a first element, and a second element, wherein the first element includes a first anode, a first element organic layer, and a reflective cathode sequentially disposed on a first substrate of the transparent substrate, and wherein the second element includes a second anode, a second element organic layer, and a transparent or translucent cathode sequentially disposed on a second surface of the transparent substrate.
1. A white light emitting organic electroluminescent device, comprising:
a transparent substrate;
a first element including a first anode, a first element organic layer, and a reflective cathode sequentially disposed on a first substrate of the transparent substrate; and
a second element including a second anode, a second element organic layer, and a transparent or translucent cathode sequentially disposed on a second surface of the transparent substrate.
2. The white light emitting organic electroluminescent device of claim 1 , wherein the first element organic layer and the second element organic layer comprise at least one electroluminescent layer selected from the group consisting of a red electroluminescent layer, a blue electroluminescent layer, a yellow electroluminescent layer, and a green electroluminescent layer, and
the electroluminescent layers disposed in the respective first element organic layer and the second element organic layer emit light of at least two different colors.
3. The white light emitting organic electroluminescent device of claim 2 , wherein the first element organic layer comprises a first hole injection layer, a first hole transport layer, a first electroluminescent layer, and a first electron transport layer sequentially stacked on top of the first anode,
the second element organic layer comprises a second hole injection layer, a second hole transport layer, a second electroluminescent layer, and a second electron transport layer sequentially stacked on top of the second anode, and
the first electroluminescent layer and the second electroluminescent layer emit light of different colors.
4. The white light emitting organic electroluminescent device of claim 2 , wherein the first element organic layer comprises a first hole injection layer, a first hole transport layer, a first electroluminescent layer, a second electroluminescent layer, a first electron transport layer, and a reflective cathode sequentially stacked on top of the first anode,
whereas the second element organic layer comprises a second hole injection layer, a second hole transport layer, a third electroluminescent layer, a fourth electroluminescent layer, a second electron transport layer, and a transparent or translucent cathode sequentially stacked on top of the second anode, and
at least one among the first to fourth electroluminescent layers emits light of a different color from the colors of the other electroluminescent layers.
5. The white light emitting organic electroluminescent device of claim 2 , wherein the first element organic layer comprises a first hole injection layer, a first hole transport layer, a first electroluminescent layer, a first electron transport layer, and a reflective cathode sequentially stacked on top of the first anode,
whereas the second element organic layer comprises a second hole injection layer, a second hole transport layer, a second electroluminescent layer, a third electroluminescent layer, a second electron transport layer, and a transparent or translucent cathode sequentially stacked on top of the second anode, and
the first electroluminescent layer is one selected from the group consisting of a red electroluminescent layer, a blue electroluminescent layer, a yellow electroluminescent layer, and a green electroluminescent layer, whereas the second electroluminescent layer is one selected from the group except the one selected as the first electroluminescent layer, and the third electroluminescent layer is the remaining one.
6. The white light emitting organic electroluminescent device of claim 2 , wherein the first element organic layer comprises a first hole injection layer, a first hole transport layer, a first electroluminescent layer, a second electroluminescent layer, a first electron transport layer, and a reflective cathode sequentially stacked on top of the first anode,
whereas the second element organic layer comprises a second hole injection layer, a second hole transport layer, a third electroluminescent layer, a second electron transport layer, and a transparent or translucent cathode sequentially stacked on top of the second anode, and
the first electroluminescent layer is one selected from the group consisting of a red electroluminescent layer, a blue electroluminescent layer, a yellow electroluminescent layer, and a green electroluminescent layer, whereas the second electroluminescent layer is one selected from the group except the one selected as the first electroluminescent layer, and the third electroluminescent layer is the remaining one.
7. The white light emitting organic electroluminescent device of claim 3 , wherein the first element organic layer further comprises a first electron injection layer between the first electron transport layer and the reflective cathode, or
the second element organic layer further comprises a second electron injection layer between the second electron transport layer and the transparent or translucent cathode, or
the first element organic layer and the second element organic layer further comprise the first electron injection layer and the second electron injection layer.
8. The white light emitting organic electroluminescent device of claim 4 , wherein the first element organic layer further comprises a first electron injection layer between the first electron transport layer and the reflective cathode, or
the second element organic layer further comprises a second electron injection layer between the second electron transport layer and the transparent or translucent cathode, or
the first element organic layer and the second element organic layer further comprise the first electron injection layer and the second electron injection layer.
9. The white light emitting organic electroluminescent device of claim 5 , wherein the first element organic layer further comprises a first electron injection layer between the first electron transport layer and the reflective cathode, or
the second element organic layer further comprises a second electron injection layer between the second electron transport layer and the transparent or translucent cathode, or
the first element organic layer and the second element organic layer further comprise the first electron injection layer and the second electron injection layer.
10. The white light emitting organic electroluminescent device of claim 6 , wherein the first element organic layer further comprises a first electron injection layer between the first electron transport layer and the reflective cathode, or
the second element organic layer further comprises a second electron injection layer between the second electron transport layer and the transparent or translucent cathode, or
the first element organic layer and the second element organic layer further comprise the first electron injection layer and the second electron injection layer.
11. The white light emitting organic electroluminescent device of claim 1 , wherein the second element further comprises a cathode protective layer on top of the transparent or translucent cathode.
12. The white light emitting organic electroluminescent device of claim 2 , wherein the second element further comprises a cathode protective layer on top of the transparent or translucent cathode.
13. The white light emitting organic electroluminescent device of claim 3 , wherein the second element further comprises a cathode protective layer on top of the transparent or translucent cathode.
14. The white light emitting organic electroluminescent device of claim 4 , wherein the second element further comprises a cathode protective layer on top of the transparent or translucent cathode.
15. The white light emitting organic electroluminescent device of claim 5 , wherein the second element further comprises a cathode protective layer on top of the transparent or translucent cathode.
16. The white light emitting organic electroluminescent device of claim 6 , wherein the second element further comprises a cathode protective layer on top of the transparent or translucent cathode.