Organic electroluminescent device

1. An organic electroluminescent (EL) device comprising:

an anode;

an emission layer;

an anode-side hole transport layer between the anode and the emission layer, the anode-side hole transport layer comprising an anode-side hole transport material doped with an electron accepting material;

a middle hole transport material layer between the anode-side hole transport layer and the emission layer, the middle hole transport material layer comprising a middle hole transport material being at least one selected from Compounds 2-2 to 2-8 and 2-10 to 2-16; and

an emission layer-side hole transport layer between the middle hole transport material layer and the emission layer, the emission layer-side hole transport layer being adjacent to the emission layer and comprising an emission layer-side hole transport material represented by the following Formula 1:

2. The organic EL device of claim 1 , wherein the electron accepting material has a lowest unoccupied molecular orbital (LUMO) level from about −9.0 eV to about −4.0 eV.

3. The organic EL device of claim 1 , wherein the anode-side hole transport layer is adjacent to the anode.

4. The organic EL device of claim 1 , wherein the anode-side hole transport material is a compound represented by Formula 2:

wherein, in Formula 2,

Ar 1 -Ar 3 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 4 is selected from 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, and a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, and

L 1 is selected from a direct linkage, a substituted or unsubstituted arylene group having 6 to 18 carbon atoms for forming a ring, and a substituted or unsubstituted heteroarylene group having 5 to 15 carbon atoms for forming a ring.

5. The organic EL device of claim 1 , wherein the emission layer comprises a luminescent material capable of emitting light via a singlet excited state.

6. The organic EL device of claim 1 , wherein the emission layer comprises a compound represented by the following Formula 3:

wherein, in Formula 3,

Ar 5 is selected from 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, and a hydroxyl group, and

n is an integer selected from 1 to 10.

7. The organic EL device of claim 6 , wherein the emission layer comprises at least one compound selected from Compounds 3-1 to 3-12, collectively denoted as Formula 8: