Organic light-emitting element
An organic light-emitting element is provided, including: an anode; a first hole assisting layer and a second hole assisting layer sequentially formed on the anode; a light-emitting layer formed on and in contact with the second hole assisting layer, the light-emitting layer including a host luminesce containing a compound having a carbazole group; at least one electron transport layer formed on the light-emitting layer; and a cathode formed on the electron transport layer, the second hole assisting layer including a hole transport compound represented by formula (I) to improve the performance of the organic light-emitting element.
1. An organic light-emitting element, comprising:
an anode;
a first hole assisting layer and a second hole assisting layer sequentially formed on the anode, the second hole assisting layer containing a hole transport compound represented by formula (I),
the first hole assisting layer containing a compound represented by formula (II),
a third hole assisting layer formed on the second hole assisting layer and containing a compound represented by formula (IV),
a light-emitting layer comprising a host luminescent material containing a compound having a carbazole group;
at least one electron transport layer formed on the light-emitting layer; and
a cathode formed on the electron transport layer,
wherein R 1 and R 2 independently represents hydrogen, unsubstituted phenyl, or phenyl substituted with C1-C4 alkyl, and R 3 represents hydrogen, C1-C4 alkyl, C1-C4 alkoxy or chlorine.
2. The organic light-emitting element of claim 1 , wherein the light-emitting layer is formed on the third hole assisting layer.
3. The organic light-emitting element of claim 1 , wherein R 1 and R 2 are the same.
4. The organic light-emitting element of claim 1 , wherein R 1 and R 2 are different from each other.
5. The organic light-emitting element of claim 1 , wherein the anode is made of indium tin oxide.
6. The organic light-emitting element of claim 1 , wherein the cathode is made of aluminum.
7. The organic light-emitting element of claim 1 , wherein R 1 and R 2 are unsubstituted phenyl, and R 3 is hydrogen.
8. The organic light-emitting element of claim 7 , wherein the hole transport compound is represented by formula (Ia),
9. The organic light-emitting element of claim 1 , wherein the light-emitting layer contains a fluorescent material.
10. The organic light-emitting element of claim 9 , wherein the fluorescent material is a guest luminescent material.
11. The organic light-emitting element of claim 10 , wherein the guest luminescent material is a compound represented by formula (III),
12. The organic light-emitting element of claim 9 , wherein the light-emitting layer emits blue light.
13. The organic light-emitting element of claim 1 , wherein the light-emitting layer contains a phosphorescent material.
14. The organic light-emitting element of claim 13 , wherein the phosphorescent material is a guest luminescent material.
15. The organic light-emitting element of claim 14 , wherein the guest luminescent material is a metal complex of iridium.
16. The organic light-emitting element of claim 13 , wherein the light-emitting layer emits red or green light.