Difluoropyridine-based compound and organic electroluminescent device using the same

A method of preparing a difluoropyridine-based compound represented by Formula 1 below, comprising:

• reacting a compound represented by Formula 1A below with a compound represented by Formula 1B or Formula 1C below:
• wherein Ar and Ar1 are each selected from the group of a substituted aryl group of 6-30 carbon atoms, an unsubstituted aryl group of 6-30 carbon atoms, a substituted heterocyclic compound of 4-30 carbon atoms, and an unsubstituted heterocyclic compound of 4-30 carbon atoms;
• X is a halogen compound;
• R1 and R2 are connected to form a ring or are each selected from the group of a hydrogen atom, halogen, a cyano group, a formyl group, a substituted alkyl group of 1-30 carbon atoms, an unsubstituted alkyl group of 1-30 carbon atoms, a substituted aryl group of 6-30 carbon atoms, an unsubstituted aryl group of 6-30 carbon atoms, a substituted heterocyclic compound of 4-30 carbon atoms, and an unsubstituted heterocyclic compound of 4-30 carbon atoms;
• n1 is an integer from 0 to 3;
• and
• n2 is an integer from 2 to 6.

An organic electroluminescent (EL) device, comprising:

• an organic layer positioned between a pair of electrodes,
• wherein the organic layer comprises a difluoropyridine-based compound represented by Formula 1:
• wherein Ar and Ar1 are each selected from the group of a substituted aryl group of 6-30 carbon atoms, an unsubstituted aryl group of 6-30 carbon atoms, a substituted heterocyclic compound of 4-30 carbon atoms, and an unsubstituted heterocyclic compound of 4-30 carbon atoms;
• R1 and R2 are connected to form a ring or are each selected from the group of a hydrogen atom, halogen, a cyano group, a formyl group, a substituted alkyl group of 1-30 carbon atoms, an unsubstituted alkyl group of 1-30 carbon atoms, a substituted aryl group of 6-30 carbon atoms, an unsubstituted aryl group of 6-30 carbon atoms, a substituted heterocyclic compound of 4-30 carbon atoms, and an unsubstituted heterocyclic compound of 4-30 carbon atoms;
• n1 is an integer from 0 to 3;
• and
• n2 is an integer from 2 to 6.