Composition for charge-transporting film and ion compound, charge-transporting film and organic electroluminescent device using same, and method for manufacturing organic electroluminescent device and method for producing charge-transporting film
View Patent ↗An excellent composition for a charge-transport film, which can be used to produce an organic electroluminescence device having excellent heat-resistant property, high hole injection/transport capacity and capable of functioning at a low voltage, is proposed.
1. An organic electroluminescence device, comprising:
a substrate;
an anode and a cathode adjacent to said substrate;
an emitting layer disposed between said anode and said cathode; and
a first layer, disposed between said anode and said emitting layer,
wherein
the first layer comprises an ionic compound consisting of a cation radical of a charge transporting compound and a counter anion of formula (7)
wherein
E 4 is an element belonging to group 13 of the long form periodic table; and
Ar 71 -Ar 74 each is independently, an aromatic hydrocarbon group that may have substituents or an aromatic heterocyclic group that may have substituents, and
wherein the first layer comprises a hole-injection layer.
2. The organic electroluminescence device according to claim 1 , wherein a content of the ionic compound in the hole-injection layer is 1 wt % or higher and 95 wt % or lower.
3. The organic electroluminescence device according to claim 1 , further comprising a hole-transport layer.
4. The organic electroluminescence device according to claim 1 , wherein said cation radical of a charge-transporting compound is an aminium cation radical.
5. The organic electroluminescence device according to claim 1 , wherein in formula (7), E 4 is a boron atom or a gallium atom, and at least one of Ar 71 -Ar 74 is a group that has one or plural electron-accepting substituents or nitrogen-containing aromatic heterocyclic groups.
6. The organic electroluminescence device according to claim 1 , wherein said counter anion is expressed by the following formula (8) or formula (9).
7. The organic electroluminescence device according to claim 1 , wherein said cation radical of the charge-transporting compound is expressed by the following general formula (10),
wherein in the general formula (10):
Ar 81 -Ar 84 represent, independently of each other, an aromatic hydrocarbon group that may have substituents or an aromatic heterocyclic group that may have substituents; and
R 81 -R 84 represent, independently of each other, an arbitrary group.
8. The organic electroluminescence device according to claim 1 , wherein said cation radical of the charge-transporting compound has a structure obtained by removing an electron from a repetitive unit of an aromatic tertiary amine macromolecule compound whose weight-average molecular weight is 1000 or larger and 1000000 or smaller.