Organic electroluminescent device
An organic electroluminescent device of which emission life may be improved. The organic electroluminescent device includes an anode, an emission layer, and an anode-side hole transport layer provided between the anode and the emission layer and including an anode-side hole transport material. An electron accepting material is doped in the anode-side hole transport layer. An intermediate hole transport material layer is provided between the anode-side hole transport layer and the emission layer and includes an intermediate hole transport material, and an emission layer-side hole transport layer is provided between the intermediate hole transport material layer and the emission layer and adjacent to the emission layer. The emission layer-side hole transport layer includes an emission layer-side hole transport material represented by the following Formula 1.
1. An organic electroluminescent (EL) device, comprising:
an anode;
an emission layer; and
a hole transport layer between the anode and the emission layer;
wherein the hole transport layer comprises a hole transport material represented by Formula 1:
wherein in Formula 1, Y is O or S;
R 1 to R 6 are each independently hydrogen, deuterium, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 15 carbon atoms, a substituted or unsubstituted silyl group, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, a substituted or unsubstituted heteroaryl group having 1 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted aryl group or heteroaryl group formed via condensation of optional adjacent substituents;
Ar 1 and Ar 2 are each independently a substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, and each of Ar 1 and Ar 2 is not a heteroaryl-containing group;
L 1 to L 3 are each independently a direct linkage, a substituted or unsubstituted alkylene group having 1 to 15 carbon atoms, a substituted or unsubstituted aralkylene group having 7 to 30 carbon atoms, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms for forming a ring, a substituted or unsubstituted heteroarylene group having 1 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted divalent silyl group;
m is an integer from 0 to 3, and
n is an integer from 0 to 4.
2. The organic EL device of claim 1 , wherein the hole transport layer comprises an anode-side hole transport layer between the anode and the emission layer;
an intermediate hole transport material layer between the anode-side hole transport layer and the emission layer; and
an emission layer-side hole transport layer between the intermediate hole transport material layer and the emission layer.
3. The organic EL device of claim 2 , wherein at least one of the intermediate hole transport material layer or the anode-side hole transport layer comprises a compound represented by Formula 2:
wherein in Formula 2, Ar 7 to Ar 9 are each independently a substituted or unsubstituted aryl group having 6 to 50 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group having 5 to 50 carbon atoms for forming a ring;
Ar 10 is hydrogen, deuterium, a halogen atom, a substituted or unsubstituted aryl group having 6 to 50 carbon atoms for forming a ring, a substituted or unsubstituted heteroaryl group having 5 to 50 carbon atoms for forming a ring, or a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms; and
L 4 is a direct linkage, a substituted or unsubstituted arylene group having 6 to 18 carbon atoms for forming a ring, or a substituted or unsubstituted heteroarylene group having 5 to 15 carbon atoms for forming a ring.
4. The organic EL device of claim 2 , wherein the anode-side hole transport layer comprises an anode-side hole transport material and doped with an electron accepting material, and
the electron accepting material has a lowest unoccupied molecular orbital (LUMO) level within a range from about −9.0 eV to about −4.0 eV.
5. The organic EL device of claim 2 , wherein the anode-side hole transport layer comprises an electron accepting material as a main component, and
the electron accepting material has a lowest unoccupied molecular orbital (LUMO) level within a range from about −9.0 eV to about −4.0 eV.
6. The organic EL device of claim 1 , wherein the emission layer comprises a compound represented by Formula 3:
wherein in Formula 3, Ar 11 is each independently hydrogen, deuterium, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 carbon atoms for forming a ring, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 50 carbon atoms for forming a ring, a substituted or unsubstituted arylthio group having 6 to 50 carbon atoms for forming a ring, a substituted or unsubstituted alkoxycarbonyl group having 2 to 50 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 carbon atoms for forming a ring, a substituted or unsubstituted heteroaryl group having 5 to 50 carbon atoms for forming a ring, a substituted or unsubstituted silyl group, a carboxyl group, a halogen atom, a cyano group, a nitro group, or a hydroxyl group; and
o is an integer from 1 to 10.