Organic electroluminescent device

1. An organic electroluminescent device comprising:

an anode,

a plurality of organic layers, and

a cathode piled one upon another on a substrate,

wherein the plurality of organic layers comprise an organic layer containing a carbazole compound selected from a carbazole compound represented by general formula (1) or (2);

wherein, in general formulas (1) and (2), each Ar is independently an aromatic group formed by removing 1 to 3 hydrogen atom(s) from an aromatic ring, the aromatic group being selected from aromatic hydrocarbon groups of 6 to 24 carbon atoms and aromatic heterocyclic groups of 3 to 23 carbon atoms; L is an aromatic group formed by removing 1 to 3 hydrogen atom(s) from an aromatic ring, the aromatic group being selected from aromatic hydrocarbon groups of 6 to 30 carbon atoms and aromatic heterocyclic groups of 3 to 30 carbon atoms; each of R 1 to R 3 is independently a hydrogen atom, an alkyl group of 1 to 10 carbon atoms, a cycloalkyl group of 3 to 11 carbon atoms, an aromatic hydrocarbon group of 6 to 18 carbon atoms, or an aromatic heterocyclic group of 3 to 17 carbon atoms; n is an integer of 1 to 3; when n is 2 or more, a plurality of Ar's or R 1 to R 3 may be identical with or different from one another,

wherein at least one of Ar and L are derived, the former as a monovalent organic group and the latter as an n-valent aromatic group, from an aromatic compound represented by the following general formula (3):

wherein each X 1 is independently CR 4 or a nitrogen atom; Y is —O—, —S—, or —NR 5 —; Z is a direct bond, —O—, —S—, —NR 6 —, —CR 7 R 8 —, or a group represented by the following formula (Z-1); each of R 4 to R 8 is independently a hydrogen atom, an alkyl group of 1 to 10 carbon atoms, a cycloalkyl group of 3 to 11 carbon atoms, an aromatic hydrocarbon group of 6 to 18 carbon atoms, or an aromatic heterocyclic group of 3 to 17 carbon atoms; however, the aforementioned aromatic group is a monovalent aromatic group in case it is Ar or an n-valent aromatic group in case it is L

wherein the carbazole compound has a total of 20 to 80 carbon atoms, and

wherein the carbazole compound is co-deposited with a phosphorescent dopant to form a single layer, said single layer being a light-emitting layer.

2. An organic electroluminescent device as described in claim 1 wherein, in general formula (3), Z is a direct bond.

3. An organic electroluminescent device as described in claim 1 wherein either Ar or L is a monovalent or n-valent aromatic group derived from an organic compound represented by the following general formula (4):

wherein each X 2 is independently CR 9 or a nitrogen atom; each of R 9 to R 12 is independently a hydrogen atom, an alkyl group of 1 to 10 carbon atoms, a cycloalkyl group of 3 to 11 carbon atoms, an aromatic hydrocarbon group of 6 to 18 carbon atoms, or an aromatic heterocyclic group of 3 to 17 carbon atoms; however, the aforementioned aromatic group is a monovalent aromatic group in case it is Ar or an n-valent aromatic group in case it is L.

4. An organic electroluminescent device as described in claim 1 wherein light emitted front the phosphorescent dopant has a peak wavelength below 550 nm.