Imide derivative, material for organic electroluminescent device and organic electroluminescent device using the same
An imide derivative represented by the following formula (A): wherein R a and R b are each a hydrogen atom, a halogen atom, a cyano group, an alkyl group, a fluoroalkyl group or an aryl group; at least one of R a and R b is a fluoroalkyl group; and R c and R d are each a substituted or unsubstituted benzyl group, an aryl group, a heterocycle, a fluoroalkyl group or an imide group.
1. A material represented by the following formula (II):
wherein R 11 to R 20 are each a hydrogen atom, a fluorine atom, a fluoroalkyl group or a cyano group, provided that a material wherein all of R 11 to R 20 are a hydrogen atom is excluded.
2. A material according to claim 1 which has a reduction potential (vs saturated calomel electrode) in a dimethylformamide solution of −0.5 V or more.
3. An organic electroluminescent device comprising:
an anode,
a cathode, and
one or a plurality of organic thin layers, including an emitting layer, the organic thin layers being interposed between the anode and the cathode;
at least one of the organic thin layers comprising the material of claim 1 .
4. The organic electroluminescent device according to claim 3 wherein the organic thin layers are a multilayer body in which a hole transporting layer, an emitting layer and an electron transporting layer are stacked in this order from the anode.
5. The organic electroluminescent device according to claim 4 wherein the hole transporting layer comprises the material.
6. The organic electroluminescent device according to claim 3 wherein the organic thin layers are a multilayer body in which a hole injecting layer, a hole transporting layer, an emitting layer, and an electron transporting layer are stacked in this order from the anode; the hole injection layer comprising the material.
7. The organic electroluminescent device according to claim 5 wherein the hole transporting layer comprising the material further comprises a phenylenediamine compound represented by the following formula (III):
wherein R 21 to R 26 are a hydrogen atom, a halogen atom, a trifluoromethyl group, an alkyl group, an aryl group, or a heterocycle; R 21 to R 26 may form a naphthalene skeleton, a carbazole skeleton, or a fluorene skeleton with a phenyl group bonded; and n represents 1 or 2.
8. The organic electroluminescent device according to claim 6 wherein the hole injecting layer comprising the material further comprises a phenylenediamine compound represented by the following formula (III):
wherein R 21 to R 26 are a hydrogen atom, a halogen atom, a trifluoromethyl group, an alkyl group, an aryl group, or a heterocycle; R 21 to R 26 may form a naphthalene skeleton, a carbazole skeleton, or a fluorene skeleton with a phenyl group bonded; and n represents 1 or 2.
9. A material according to claim 1 , which has the following formulae (II-8) or (II-9):