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US 10,381,589 B2Granted
Organic EL element and organic EL display panel
AssigneeJoled Inc.
InventorsKosuke Mishima, Junko Tanaka, Hiroshi Katagiri, Takahiro Komatsu
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Abstract
An organic electroluminescence (EL) element including an anode, a light-emitting layer above the anode, a first functional layer on and in contact with the light-emitting layer, a second functional layer on and in contact with the first functional layer, and a cathode above the second functional layer. A lowest unoccupied molecular orbital (LUMO) level of the first functional layer is lower than at least one of a LUMO level of the second functional layer and a Fermi level of a metal material included in the second functional layer.
Claims28
An organic electroluminescence (EL) element comprising:
- an anode;
- a light-emitting layer disposed above the anode;
- a first functional layer disposed on and in contact with the light-emitting layer;
- a second functional layer disposed on and in contact with the first functional layer;
- and
- a cathode disposed above the second functional layer, wherein
- the second functional layer includes organic material having electron transport mobility and is configured to transport electrons from the cathode, and
- a lowest unoccupied molecular orbital (LUMO) level of the first functional layer is lower than at least one of a LUMO level of the second functional layer and a Fermi level of a metal material included in the second functional layer,
- wherein the first functional layer is configured to have a negative value for an energy barrier for injection of electrons from the second functional layer to the first functional layer, such that an electron injection barrier from the second functional layer to the first functional layer is smaller than an electron injection barrier from the first functional layer to the light-emitting layer.
6 more elements
An organic electroluminescence (EL) element comprising:
- an anode;
- a light-emitting layer disposed above the anode;
- a first functional layer disposed on and in direct contact with the light-emitting layer;
- a second functional layer disposed on and in contact with the first functional layer;
- and
- a cathode disposed above the second functional layer, wherein
- the first functional layer includes a first metal material that is an alkali metal or an alkaline earth metal, and
- a Fermi level of the first metal material included in the first functional layer is lower than at least one of a LUMO level of the second functional layer and a Fermi level of a second metal material included in the second functional layer,
- wherein the first functional layer is configured to have a negative value for an energy barrier for injection of electrons from the second functional layer to the first functional layer, such that an electron injection barrier from the second functional layer to the first functional layer is smaller than an electron injection barrier from the first functional layer to the light-emitting layer.
6 more elements
An organic electroluminescence (EL) element comprising:
- an anode;
- a light-emitting layer disposed above the anode;
- a first functional layer disposed on and in contact with the light-emitting layer;
- a second functional layer disposed on and in contact with the first functional layer;
- and
- a cathode disposed above the second functional layer, wherein
- the second functional layer includes organic material having electron transport mobility and is configured to transport electrons from the cathode, and
- a difference between a lowest unoccupied molecular orbital (LUMO) level of the light-emitting layer and a LUMO level of the first functional layer is at least 0.5 eV,
- wherein the first functional layer is configured to have a negative value for an energy barrier for injection of electrons from the second functional layer to the first functional layer, such that an electron injection barrier from the second functional layer to the first functional layer is smaller than an electron injection barrier from the first functional layer to the light-emitting layer.
6 more elements
An organic electroluminescence (EL) element comprising:
- an anode;
- a light-emitting layer disposed above the anode;
- a first functional layer disposed on and in direct contact with the light-emitting layer;
- a second functional layer disposed on and in contact with the first functional layer;
- and
- a cathode disposed above the second functional layer, wherein
- the first functional layer includes a first metal material that is an alkali metal or an alkaline earth metal, and
- a difference between a lowest unoccupied molecular orbital (LUMO) level of the light-emitting layer and a Fermi level of the first metal material included in the first functional layer is at least 0.5 eV,
- wherein the first functional layer is configured to have a negative value for an energy barrier for injection of electrons from the second functional layer to the first functional layer, such that an electron injection barrier from the second functional layer to the first functional layer is smaller than an electron injection barrier from the first functional layer to the light-emitting layer.
6 more elements
Dependencies are inferred from the claim text.