Multi-component host material and organic electroluminescent device comprising the same

An organic electroluminescent device comprising at least one light-emitting layer between an anode and a cathode, wherein the light-emitting layer comprises a host and a phosphorescent dopant;

• the host consists of multi-component host compounds;
• at least a first host compound of the multi-component host compounds is represented by the following formula 1 which is a bicarbazole derivative containing an aryl group, and a second host compound is represented by the following formula 2 which is a carbazole derivative including a nitrogen-containing heteroaryl group:
• wherein
• A1 and A2 each independently represent a substituted or unsubstituted (C6-C30)aryl group;
• X1 to X16 each independently represent hydrogen, deuterium, a halogen, a cyano group, a substituted or unsubstituted (C1-C30)alkyl group, a substituted or unsubstituted (C2-C30)alkenyl group, a substituted or unsubstituted (C2-C30)alkynyl group, a substituted or unsubstituted (C3-C30)cycloalkyl group, a substituted or unsubstituted (C6-C60)aryl group, a substituted or unsubstituted 3- to 30-membered heteroaryl group, a substituted or unsubstituted tri(C1-C30)alkylsilyl group, a substituted or unsubstituted tri(C6-C30)arylsilyl group, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl group, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino group;
• or are linked between adjacent substituents to form a substituted or unsubstituted mono- or polycyclic, (C3-C30) alicyclic or aromatic ring whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen and sulfur;
• Ma represents a substituted or unsubstituted nitrogen-containing 5- to 30-membered heteroaryl group;
• La represents a single bond, or a substituted or unsubstituted (C6-C30)arylene group;
• Xa to Xh each independently represent hydrogen, deuterium, a halogen, a cyano group, a substituted or unsubstituted (C1-C30)alkyl group, a substituted or unsubstituted (C2-C30)alkenyl group, a substituted or unsubstituted (C2-C30)alkynyl group, a substituted or unsubstituted (C3-C30)cycloalkyl group, a substituted or unsubstituted (C6-C60)aryl group, a substituted or unsubstituted 3- to 30-membered heteroaryl group, a substituted or unsubstituted tri(C1-C30)alkylsilyl group, a substituted or unsubstituted tri(C6-C30)arylsilyl group, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl group, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino group;
• or are linked between adjacent substituents to form a substituted or unsubstituted mono- or polycyclic, (C3-C30) alicyclic or aromatic ring whose carbon atom(s) ring may be replaced with at least one hetero atom selected from nitrogen, oxygen and sulfur;
• the fused aromatic or heteroaromatic ring is selected from the group consisting of benzene, indole, indene, benzofuran and benzothiophene, which may be further substituted with a (C1-C10)alkyl group or a (C6-C15)aryl group;
• and
• the heteroaryl group contains at least one hetero atom selected from B, N, O, S, P(═O), Si and P.