Organic light-emitting device
View Patent ↗Provided is an organic light-emitting device including a plurality of pixels, each including a first sub-pixel, a second sub-pixel, and a third sub-pixel having different colors from each other. Each of the pixels includes a substrate, a first electrode layer on the substrate, a first light-emitting layer disposed on the first electrode in the first, second and third sub-pixels, an auxiliary layer disposed on the first light-emitting layer in the second and third sub-pixels, a second light-emitting layer disposed on the auxiliary layer in the second sub-pixel, a third light-emitting layer disposed on the auxiliary layer in the third sub-pixel, and a second electrode layer on the first, second, and third light-emitting layers.
1. An organic light-emitting device comprising:
a plurality of pixels, each pixel comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel having different colors from each other,
wherein each of the pixels comprises:
a substrate;
a first electrode layer on the substrate;
a first light-emitting layer disposed on the first electrode layer in the first, second, and third sub-pixels and formed as a common layer to an entire surface of the first, second, and third sub-pixels;
an auxiliary layer disposed on the first light-emitting layer in the second and third sub-pixels and not being formed in the first sub-pixel;
a second light-emitting layer disposed on the auxiliary layer in the second sub-pixel;
a third light-emitting layer disposed on the auxiliary layer in the third sub-pixel; and
a second electrode layer disposed on the first, second, and third light-emitting layers.
2. The organic light-emitting device of claim 1 , wherein the auxiliary layer comprises a hole injection material and a hole transport material.
3. The organic light-emitting device of claim 1 , wherein the auxiliary layer comprises: a first auxiliary layer including a hole injection material; and
a second auxiliary layer on the first auxiliary layer and including a hole transport material.
4. The organic light-emitting device of claim 1 , wherein the auxiliary layer has a concentration gradient in which the concentration of a hole injection material is greater than a concentration of a hole transport material in a lower portion of the auxiliary layer, and in which the concentration of a hole transport material is greater than a concentration of a hole injection material in an upper portion of the auxiliary layer.
5. The organic light-emitting device of any one claim of claim 2 , wherein the hole injection material comprises a phthalocyanine compound, m-MTDATA, TDATA, 2T-NATA, NPB, PEDOT/PSS, Pani/DBSA, Pani/CSA, or PANI/PSS, and the hole transport material comprises N-phenylcarbazole, polyvinylcarbazole, TPD, α-NPD, or TCTA.
6. The organic light-emitting device of claim 1 , wherein the auxiliary layer comprises a p-type dopant.
7. The organic light-emitting device of claim 6 , wherein the p-type dopant comprises tetracyanoquinodimethane (TCNQ), 2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinodimethane (F4TCNQ), or 1,3,2-dioxaborine.
8. The organic light-emitting device of claim 1 , wherein the first electrode layer is an anode, and the second electrode layer is a cathode.
9. The organic light-emitting device of claim 1 , wherein the first light-emitting layer is a blue light-emitting layer, the second light-emitting layer is a red light-emitting layer, and the third light-emitting layer is a green light-emitting layer.
10. The organic light-emitting device of claim 1 , further comprising:
a hole injection layer between the first electrode layer and the first light-emitting layer; and
a hole transport layer on the hole injection layer.
11. The organic light-emitting device of claim 1 , further comprising:
an electron transport layer between the second electrode layer and the first, second, and third light-emitting layers; and
an electron injection layer on the electron transport layer.
12. An organic light-emitting device comprising:
a plurality of pixels, each pixel comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel having different colors from each other,
wherein each of the pixels comprises:
a substrate;
a first electrode layer on the substrate;
a first light-emitting layer disposed on the first electrode layer, in the first, second, and third sub-pixels and formed as a common layer to an entire surface of the first, second, and third sub-pixels;
an auxiliary layer disposed on the first light-emitting layer, in the second sub-pixel and the third sub-pixel and not being formed in the first sub-pixel;
a second light-emitting layer disposed on the auxiliary layer, in the second sub-pixel;
a third light-emitting layer disposed on the first light-emitting layer, the auxiliary layer, and the second light-emitting layer, in the first, second, and third sub-pixels; and
a second electrode layer disposed on the third light-emitting layer.
13. The organic light-emitting device of claim 12 , wherein the third light-emitting layer has an electron transport characteristic.
14. The organic light-emitting device of claim 12 , wherein the first light-emitting layer is a blue light-emitting layer, the second light-emitting layer is a red light-emitting layer, and the third light-emitting layer is a green light-emitting layer.
15. The organic light-emitting device of claim 12 , wherein the first light-emitting layer is a blue light-emitting layer, the second light-emitting layer is a green light-emitting layer, and the third light-emitting layer is a red light-emitting layer.
16. The organic light-emitting device of claim 12 , wherein the auxiliary layer comprises:
a first auxiliary layer including a hole injection material; and
a second auxiliary layer on the first auxiliary layer and including a hole transport material.
17. The organic light-emitting device of claim 12 , wherein the auxiliary layer comprises a p-type dopant.
18. The organic light-emitting device of claim 12 , wherein the first electrode layer is an anode, and the second electrode layer is a cathode.
19. The organic light-emitting device of claim 12 , further comprising:
a hole injection layer between the first electrode layer and the first light-emitting layer; and
a hole transport layer on the hole injection layer.
20. The organic light-emitting device of claim 12 , further comprising:
an electron transport layer between the second electrode layer and the first, second, and third light-emitting layers; and
an electron injection layer on the electron transport layer.