Organic electroluminescence device and monoamine compound for organic electroluminescence device

An organic electroluminescence device, comprising:

• a first electrode;
• a second electrode on the first electrode;
• and
• a plurality of organic layers between the first electrode and the second electrode, wherein at least one organic layer among the plurality of organic layers comprises a monoamine compound represented by the following Formula 1:
• wherein, in Formula 1,
• at least one selected from Ar1, Ar2 and Ar3 is represented by the following Formula 2, and the remaining ones of Ar1, Ar2 and Ar3 are each independently a substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms for forming a ring:
• in Formula 2,
• R1 to R3 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms for forming a ring,
• “m” is 0 or 1,
• “a”, “b”, “x” and “y” are each independently an integer of 0 to 4,
• wherein if “m” is 0, “x” is an integer of 1 or more, and if “m” is 1, “x+y” is an integer of 1 or more, and
• Ad is represented by the following Formula 3:
• in Formula 3,
• R4 is a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms for forming a ring, and
• “n” is an integer of 0 to 15.