Light-emitting element, light-emitting device, lighting device, and electronic device
First Claim
1. A light-emitting element comprising:
- n (n is a natural number of two or more) light-emitting layers between an anode and a cathode;
a first layer between an m-th (in is a natural number, 1≦
m≦
n−
1) light-emitting layer and an (m+1)-th light-emitting layer, wherein the first layer contains one selected from the group consisting of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, and a rare earth metal compound;
a second layer between the first layer and the (m+1)-th light-emitting layer, wherein the second layer contains a substance having electron-transport property; and
a charge-generation layer between the second layer and the (m+1)-th light-emitting layer, wherein the charge-generation layer contains a substance having hole-transport property and an acceptor substance,wherein the substance having hole-transport property is a carbazole derivative or aromatic hydrocarbon,wherein the acceptor substance is a transition metal oxide or an oxide of a metal belonging to any of Groups 4 to 8 of the periodic table,wherein a mass ratio of the acceptor substance to the substance having hole-transport property in the charge-generation layer is from 0.1;
1 to 4.0;
1, both inclusive, andwherein the substance having electron-transport property in the second layer is a perylene derivative or a nitrogen-containing condensed aromatic compound.
1 Assignment
0 Petitions
Accused Products
Abstract
A light-emitting element is provided, in which n (n is a natural number of two or more) EL layers are provided between an anode and a cathode. Between the m-th (in is a natural number, 1≦m≦n−1) EL layer and the (m+1)-th EL layer, a first layer containing any of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, and a rare earth metal compound, a second layer containing a substance having high electron-transport properties in contact with the first layer, and a charge-generation layer containing a substance having high hole-transport properties and an acceptor substance in contact with the second layer are provided in this order over the anode. The charge-generation layer does not have a peak of an absorption spectrum in a visible light region.
50 Citations
18 Claims
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1. A light-emitting element comprising:
-
n (n is a natural number of two or more) light-emitting layers between an anode and a cathode; a first layer between an m-th (in is a natural number, 1≦
m≦
n−
1) light-emitting layer and an (m+1)-th light-emitting layer, wherein the first layer contains one selected from the group consisting of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, and a rare earth metal compound;a second layer between the first layer and the (m+1)-th light-emitting layer, wherein the second layer contains a substance having electron-transport property; and a charge-generation layer between the second layer and the (m+1)-th light-emitting layer, wherein the charge-generation layer contains a substance having hole-transport property and an acceptor substance, wherein the substance having hole-transport property is a carbazole derivative or aromatic hydrocarbon, wherein the acceptor substance is a transition metal oxide or an oxide of a metal belonging to any of Groups 4 to 8 of the periodic table, wherein a mass ratio of the acceptor substance to the substance having hole-transport property in the charge-generation layer is from 0.1;
1 to 4.0;
1, both inclusive, andwherein the substance having electron-transport property in the second layer is a perylene derivative or a nitrogen-containing condensed aromatic compound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light-emitting element comprising:
-
n (n is a natural number of two or more) light-emitting layers between an anode and a cathode; a first layer between an m-th (m is a natural number, 1≦
m≦
n−
1) light-emitting layer and an (m+1)-th light-emitting layer, wherein the first layer contains a substance having an electron-transport property and a donor substance;a second layer between the first layer and the (m+1)-th light-emitting layer, wherein the second layer contains a substance having electron-transport property; and a charge-generation layer between the second layer and the (m+1)-th light-emitting layer, wherein the charge-generation layer contains a substance having hole-transport property and an acceptor substance, wherein the substance having hole-transport property is a carbazole derivative or aromatic hydrocarbon, wherein the acceptor substance is a transition metal oxide or an oxide of a metal belonging to any of Groups 4 to 8 of the periodic table, wherein a mass ratio of the acceptor substance to the substance having hole-transport property in the charge-generation layer is from 0.1;
1 to 4.0;
1, both inclusive, andwherein the substance having electron-transport property in the second layer is a perylene derivative or a nitrogen-containing condensed aromatic compound. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification