Organic electroluminescent device
AssigneeIdemitsu Kosan Co., Ltd.
InventorsToshihiro Iwakuma, Hiroya Yasuda, Kiyoshi Ikeda, Keiko Yamamichi, Takashi Arakane, Chishio Hosokawa
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Abstract
Provided is an organic electroluminescent device in which an organic thin film layer comprising a single layer or plural layers comprising a phosphorescence light-emitting layer containing at least a host material and a phosphorescent organic metal complex is interposed between a cathode and an anode, wherein the total of the halogen element mass concentrations of bromine, iodine and chlorine which are contained as impurities in the host material constituting the light-emitting layer described above is 50 ppm or less. It has a high emission luminance, a high luminous efficiency and a long life.
Claims17
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;
- RA, RB and RC 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;
- RA, RB and RC each may be the same or different;
- Formula (2):
- RA—Ar′—RB (2)
- wherein Ar′ represents a substituted or non-substituted divalent aromatic hydrocarbon group having 6 to 18 ring carbon atoms;
- RA, and RB 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 RA and RB 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;
- RA and RB 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;
- RA, RB and RC each may be the same or different;
- in Formula (3), X1 represents a halogen atom;
- in Formula (4), one of X2 to X3 represents a halogen atom, and the remainder represents a halogen atom or a hydrogen atom;
- in Formula (5), at least one of X4 to X6 represents a halogen atom, and the remainder represents a halogen atom or a hydrogen atom;
- and
- provided that when X2 to X6 are hydrogen atoms, Ar is reduced in a valency according to the number of the hydrogen atoms;
- and when two or more of X2 to X3 or X4 to X6 are halogen atoms, they may the same atom.
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 im urit 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;
- RA, RB and RC 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;
- RA, RB and RC each may be the same or different;
- Formula (2):
- RA—Ar′—RB (2)
- wherein Ar′ represents a substituted or non-substituted divalent aromatic hydrocarbon group having 6 to 18 ring carbon atoms;
- RA RB 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 RA and RB each may be the same or different,
- wherein the host material further comprises a halide comprising a halogen element and having a structure represented by the following Formulas (6) and/or (7):
- RA—Ar′—X1 (6)
- X2—Ar′—X3 (7)
- wherein Ar′ represents a substituted or non-substituted divalent aromatic hydrocarbon group having 6 to 18 ring carbon atoms;
- RA each represents 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;
- in Formula (6), X1 represents a halogen atom;
- in Formula (7), one of X2 to X3 represents a halogen atom, and the remainder represents a halogen atom or a hydrogen atom;
- provided that when X2 to X3 are hydrogen atoms, Ar′ is reduced in a valency according to the number of the hydrogen atoms;
- and when two or more of X2 to X3 are halogen atoms, they may the same atom.
Dependencies are inferred from the claim text.