An organic compound and an organic electroluminescent device using the same

An organic compound represented by the following Chemical Formula 1 or 2:

• wherein, in Chemical Formulas 1 and 2,
• X1 and X2 are different from each other and are CR3 or N, wherein one of X1 and X2 is N and the other is CR3,
• R1 and R2 are the same as or different from each other, each independently being selected from:
• a C6 to C60 aryl group,
• Ar1 is a substituent represented by any one of the following Chemical Formulas F1, F5 and F6:
• R3 is selected from:
• hydrogen, or deuterium,
• the aryl group of R1 and R2 are each independently substituted or unsubstituted with one or more substituents of:
• deuterium, halogen, a cyano group, a nitro group, a C2 to C40 alkenyl group, a C2 to C40 alkynyl group, a C3 to C40 cycloalkyl group, a heterocycloalkyl group having 3 to 40 nuclear atoms, a C1 to C40 alkyl group, a C6 to C60 aryl group, a heteroaryl group having 5 to 60 nuclear atoms, a C1 to C40 alkyloxy group, a C6 to C60 aryloxy group, a C1 to C40 alkylsilyl group, a C6 to C60 arylsilyl group, a C1 to C40 alkylboron group, a C6 to C60 arylboron group, a C6 to C60 arylphosphine group, a C6 to C60 arylphosphine oxide group, and a C6 to C60 arylamine group, and when the substituents are plural in number, the substituents are the same as or different from each other.