Patent ID: 8895154

Claim:
An organic electroluminescent device in which an organic thin film layer comprising a single layer or plural layers comprising a phosphorescent light-emitting layer is interposed between a cathode and an anode, wherein a halogen element mass concentration of bromine which is contained as an impurity in the host material of the phosphorescent light-emitting layer is 30 ppm or less, wherein the phosphorescent light-emitting layer comprises at least one phosphorescent organic iridium complex and at least one compound selected from the group consisting of an aromatic hydrocarbon compound and an aromatic heterocyclic compound and wherein the aromatic hydrocarbon compound and the aromatic heterocyclic compound have a structure represented by the following Formulae (1) or (2): Formula (1): wherein Ar represents a substituted or non-substituted trivalent aromatic hydrocarbon group having 6 to 18 ring carbon atoms; R A , R B and R C each represent independently a substituted or non-substituted aromatic hydrocarbon group having 6 to 18 ring carbon atoms, a substituted or non-substituted aromatic heterocyclic group having 3 to 14 ring carbon atoms; R A , R B and R C each may be the same or different; Formula (2): R A —Ar′—R B (2) wherein Ar′ represents a substituted or non-substituted divalent aromatic hydrocarbon group having 6 to 18 ring carbon atoms; R A , and R B each represent independently a substituted or non-substituted aromatic hydrocarbon group having 6 to 18 ring carbon atoms, a substituted or non-substituted aromatic heterocyclic group having 3 to 14 ring carbon atoms or a substituted, and R A and R B each may be the same or different, wherein the host material further comprises a halide comprising a halogen element and having at least one structure represented by the following Formulas (3) to (5): wherein Ar represents a substituted or non-substituted trivalent aromatic hydrocarbon group having 6 to 18ring carbon atoms; R A and R B each represent independently a substituted or non-substituted aromatic hydrocarbon group having 6 to 18 ring carbon atoms, a substituted or non-substituted aromatic heterocyclic group having 3 to 14 ring carbon atoms; R A , R B and R C each may be the same or different; in Formula (3), X 1 represents a halogen atom; in Formula (4), one of X 2 to X 3 represents a halogen atom, and the remainder represents a halogen atom or a hydrogen atom; in Formula (5), at least one of X 4 to X 6 represents a halogen atom, and the remainder represents a halogen atom or a hydrogen atom; and provided that when X 2 to X 6 are hydrogen atoms, Ar is reduced in a valency according to the number of the hydrogen atoms; and when two or more of X 2 to X 3 or X 4 to X 6 are halogen atoms, they may the same atom.