Indolocarbazole derivatives and organic electroluminescent devices using the same

An organic electroluminescent device comprising a first electrode, a second electrode opposite to the first electrode, and one or more organic layers interposed between the first and second electrodes,

• wherein at least one of the organic layers comprises the organic electroluminescent compound represented by Formula A, and optionally another organic electroluminescent compound represented by Formula A:
• wherein R1 to R17 are each independently selected from the group consisting of hydrogen, deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C2-C20alkenyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C5-C20 cycloalkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C1-C20 alkylthioxy, substituted or unsubstituted C5-C30 arylthioxy, substituted or unsubstituted C1-C30 alkylamine, substituted or unsubstituted C5-C30 arylamine, substituted or unsubstituted C6-C50 aryl, substituted or unsubstituted C3-C50 heteroaryl, substituted or unsubstituted silyl, substituted or unsubstituted germanium, substituted or unsubstituted boron, substituted or unsubstituted aluminum, carbonyl, phosphoryl, amino, nitrile, hydroxyl, nitro, halogen, selenium, tellurium, amide, and ester, with the proviso that R10 and R14 optionally forms a fused aliphatic, aromatic, heteroaliphatic or heteroaromatic ring,
• wherein the organic electroluminescent device further comprises a capping layer formed on at least one of a lower surface of the first electrode and an upper surface of the second electrode opposite to the one or more organic layers, and
• wherein the capping layer comprises the compound represented by Formula A.