Organic electroluminescent device

1. An electroluminescent device comprising:

an anode;

a cathode; and

at least one organic layer sandwiched between said anode and said cathode, said organic layer including at least a light emitting layer,

said organic layer containing a compound represented with the chemical formula C1, alone or in combination:

wherein R 1 to R 4 each independently represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted amino group, a nitro group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted aralkyl group,

wherein at least one of R 1 to R 4 is a di-aryl amino group represented with —NAr 1 Ar 2 where each of Ar 1 and Ar 2 independently indicates an aryl group having a carbon number of 6 to 20 both inclusive,

wherein R 5 to R 12 each independently represents a hydrogen atom, a halogen atom, a hydroxyl group, a substituted or unsubstituted amino group, a nitro group, a cyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkoxycarbonyl group, or a carboxyl group, and

wherein any two of R 1 to R 4 except said diaryl amino group and R 5 to R 12 form a ring.

2. The organic electroluminescent device as set forth in claim 1 , wherein each of said Ar 1 and Ar 2 includes a substituent.

3. The organic electroluminescent device as set forth in claim 1 , wherein said organic layer includes a hole transporting layer containing said compound represented with said chemical formula C1, alone or in combination.

4. The organic electroluminescent device as set forth in claim 1 , wherein said anode has a work function equal to or greater than 4.5 eV.

5. The organic electroluminescent device as set forth in claim 4 , wherein said cathode has a smaller work function than that of said anode.

6. The organic electroluminescent device as set forth in claim 1 , wherein said organic layer has a thickness in the range of 1 nanometer to 1 micrometer both inclusive.

7. An organic layer for an electroluminescent device, said organic layer, comprising:

a compound represented by the chemical formula C1, alone or in combination:

wherein R 1 to R 4 each independently represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted amino group, a nitro group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted aralkyl group,

wherein at least one of R 1 to R 4 is a di-aryl amino group represented with —NAr 1 Ar 2 where each of Ar 1 and Ar 2 independently indicates an aryl group having a carbon number of 6 to 20 both inclusive,

wherein R 5 to R 12 each independently represents a hydrogen atom, a halogen atom, a hydroxyl group, a substituted or unsubstituted amino group, a nitro group, a cyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkoxycarbonyl group, or a carboxyl group, and

wherein any two of R 1 to R 4 except said diaryl amino group and R 5 to R 12 may form a ring.

8. The organic layer of claim 1 , wherein each of Ar 1 and Ar 2 comprises a substituent.

9. The organic layer of claim 1 ,

wherein the organic layer includes a hole transporting layer comprising a compound represented by chemical formula C1, alone or in combination.

10. The organic layer of claim 1 , wherein the organic layer is about 1 nanometer to about 1 micrometer thick.