Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device
First Claim
1. A light-emitting element comprising:
- a first EL layer between an anode and a cathode,wherein the first EL layer includes a first light-emitting layer and a second light-emitting layer,wherein the first light-emitting layer is located between the cathode and the second light-emitting layer,wherein the first light-emitting layer is in contact with the second light-emitting layer,wherein an emission peak of the second light-emitting layer is at a shorter wavelength than that of the first light-emitting layer,wherein the first light-emitting layer includes a host material and a guest material, andwherein a lowest unoccupied molecular orbital level of the guest material is in a range of ±
0.1 eV of a lowest unoccupied molecular orbital level of the host material.
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Abstract
A light-emitting element with a high current efficiency is provided. A low-power consumption light-emitting device is also provided. In addition, low-power consumption electronic device and lighting device are provided. The light-emitting element includes an EL layer between a pair of electrodes. The EL layer includes a light-emitting layer. The light-emitting layer includes a first light-emitting layer and a second light-emitting layer. The emission peak of the second light-emitting layer is at a shorter wavelength than that of the first light-emitting layer. The first light-emitting layer includes a host material and a guest material. The LUMO level of the guest material is in the range of ±0.1 eV of the LUMO level of the host material.
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Citations
20 Claims
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1. A light-emitting element comprising:
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a first EL layer between an anode and a cathode, wherein the first EL layer includes a first light-emitting layer and a second light-emitting layer, wherein the first light-emitting layer is located between the cathode and the second light-emitting layer, wherein the first light-emitting layer is in contact with the second light-emitting layer, wherein an emission peak of the second light-emitting layer is at a shorter wavelength than that of the first light-emitting layer, wherein the first light-emitting layer includes a host material and a guest material, and wherein a lowest unoccupied molecular orbital level of the guest material is in a range of ±
0.1 eV of a lowest unoccupied molecular orbital level of the host material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light-emitting element comprising:
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a first EL layer between an anode and a cathode, wherein the first EL layer includes a first light-emitting layer and a second light-emitting layer, wherein the first light-emitting layer is located between the cathode and the second light-emitting layer, wherein the first light-emitting layer is in contact with the second light-emitting layer, wherein an emission peak of the second light-emitting layer is at a shorter wavelength than that of the first light-emitting layer, wherein the first light-emitting layer and the second light-emitting layer include the same host material, wherein the first light-emitting layer includes a guest material, and wherein a lowest unoccupied molecular orbital level of the guest material is in a range of ±
0.1 eV of a lowest unoccupied molecular orbital level of the host material. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification