Organic electroluminescent device
View Patent ↗An organic electroluminescent device comprising an organic layer is provided. The organic layer is an electron transport layer comprising an electron transport material and a blue emission material. This electron transport layer causes an increase in the blue emission efficiency and lifespan of the organic electroluminescent device while improving efficiency in red and green ranges, a driving voltage, a color coordinate, and the lifespan of the organic electroluminescent device are not changed.
1. An organic electroluminescent device comprising:
a first electrode;
a hole transport layer formed on the first electrode;
an emission layer formed on the hole transport layer;
an electron transport layer comprising an electron transport material and a blue emission material formed on the emission layer; and
a second electrode formed directly on the electron transport layer,
wherein the blue emission material comprises a compound represented by the following chemical structure:
and
wherein the electron transport layer includes 30 wt % to 70 wt % of the blue emission material based on the weight of the electron transport material.
2. The organic electroluminescent device of claim 1 ,
wherein the electron transport material comprises a compound selected from the group consisting of the compounds represented by the following chemical structures:
3. The organic electroluminescent device of claim 1 ,
wherein the electron transport layer is in the range of 150 Å to 400 Å thick.
4. The organic electroluminescent device of claim 1 , further comprising:
a layer selected from the group consisting of a hole injection layer and a hole blocking layer.
5. The organic electroluminescent device of claim 1 ,
wherein a hole injection layer or the hole transport layer is formed between the first electrode and the emission layer.
6. The organic electroluminescent device of claim 1 ,
wherein the electron transport layer comprises the following chemical structures:
7. An organic electroluminescent device, comprising:
a first electrode;
an emission layer formed on the first electrode;
an electron transport layer comprising an electron transport material and a blue emission material formed on the emission layer; and
a second electrode formed directly on the electron transport layer,
wherein the blue emission material comprises a compound represented by the following chemical structure:
and
wherein the electron transport layer includes 30 wt % to 70 wt % of the blue emission material based on the weight of the electron transport material.
8. The organic electroluminescent device of claim 7 ,
wherein the electron transport material is a compound selected from the group consisting of the compounds represented by the following chemical structures:
9. An organic electroluminescent device comprising:
a first electrode;
a hole transport layer formed on the first electrode;
an emission layer formed on the hole transport layer;
an electron transport layer comprising an electron transport material and a blue emission material formed on the emission layer;
an electrode injection layer formed directly on the electron transport layer; and
a second electrode formed on the electrode injection layer,
wherein the blue emission material comprises a compound represented by the following chemical structure:
and
wherein the electron transport layer includes 30 wt % to 70 wt % of the blue emission material based on the weight of the electron transport material.
10. The organic electroluminescent device of claim 9 ,
wherein the electron transport material comprises a compound selected from the group consisting of the compounds represented by the following chemical structures:
11. The organic electroluminescent device of claim 9 ,
wherein the electron transport layer is in the range of 150 Å to 400 Å thick.
12. The organic electroluminescent device of claim 9 , further comprising:
a layer selected from the group consisting of a hole injection layer and a hole blocking layer.
13. The organic electroluminescent device of claim 9 , wherein a hole injection layer or the hole transport layer is formed between the first electrode and the emission layer.