Light-emitting element, lighting device, light-emitting device, and electronic device
First Claim
1. A light-emitting element comprising:
- a first electrode;
a first light-emitting layer over the first electrode, the first light-emitting layer comprising a first compound and a first host material, wherein the first compound is capable of converting an energy of a triplet excited state of the first compound into a first light;
a second light-emitting layer over the first light-emitting layer, the second light-emitting layer comprising a second compound and a second host material, wherein the second compound is capable of converting an energy of a triplet excited state of the second compound into a second light;
a third light-emitting layer over the second light-emitting layer, the third light-emitting layer comprising a third compound and a third host material, wherein the third compound is capable of converting an energy of a triplet excited state of the third compound into a third light; and
a second electrode over the third light-emitting layer,wherein between a peak of an emission spectrum of the first compound, a peak of an emission spectrum of the second compound, and a peak of an emission spectrum of the third compound, the peak of the emission spectrum of the second compound is on a longest wavelength side and the peak of the emission spectrum of the third compound is on a shortest wavelength side, andwherein the third host material has higher triplet excitation energy than the first host material and the second host material.
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Abstract
A light-emitting element includes a first electrode; a first light-emitting layer over the first electrode, containing a first phosphorescent compound and a first host material; a second light-emitting layer over the first light-emitting layer, containing a second phosphorescent compound and a second host material; a third light-emitting layer over the second light-emitting layer, containing a third phosphorescent compound and a third host material; and a second electrode over the third light-emitting layer. Between peaks of emission spectra of the first, second, and third phosphorescent compounds, the peak of the emission spectrum of the second phosphorescent compound is on the longest wavelength side and that of the emission spectrum of the third phosphorescent compound is on the shortest wavelength side. The third host material has higher triplet excitation energy than the first host material and the second host material.
31 Citations
19 Claims
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1. A light-emitting element comprising:
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a first electrode; a first light-emitting layer over the first electrode, the first light-emitting layer comprising a first compound and a first host material, wherein the first compound is capable of converting an energy of a triplet excited state of the first compound into a first light; a second light-emitting layer over the first light-emitting layer, the second light-emitting layer comprising a second compound and a second host material, wherein the second compound is capable of converting an energy of a triplet excited state of the second compound into a second light; a third light-emitting layer over the second light-emitting layer, the third light-emitting layer comprising a third compound and a third host material, wherein the third compound is capable of converting an energy of a triplet excited state of the third compound into a third light; and a second electrode over the third light-emitting layer, wherein between a peak of an emission spectrum of the first compound, a peak of an emission spectrum of the second compound, and a peak of an emission spectrum of the third compound, the peak of the emission spectrum of the second compound is on a longest wavelength side and the peak of the emission spectrum of the third compound is on a shortest wavelength side, and wherein the third host material has higher triplet excitation energy than the first host material and the second host material. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A light-emitting element comprising:
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a first electrode; a first light-emitting layer over the first electrode, the first light-emitting layer comprising a first compound and a first host material, wherein the first compound is capable of converting an energy of a triplet excited state of the first compound into a first light; a second light-emitting layer over the first light-emitting layer, the second light-emitting layer comprising a second compound and a second host material, wherein the second compound is capable of converting an energy of a triplet excited state of the second compound into a second light; a third light-emitting layer over the second light-emitting layer, the third light-emitting layer comprising a third compound and a third host material, wherein the third compound is capable of converting an energy of a triplet excited state of the third compound into a third light; and a second electrode over the third light-emitting layer, wherein the first light is green light, wherein the second light is red light, and wherein the third light is blue light. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A light-emitting element comprising:
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a first electrode; a first light-emitting layer over the first electrode, the first light-emitting layer comprising a first compound and a first host material, wherein the first compound is capable of converting an energy of a triplet excited state of the first compound into a first light; a second light-emitting layer over the first light-emitting layer, the second light-emitting layer comprising a second compound and a second host material, wherein the second compound is capable of converting an energy of a triplet excited state of the second compound into a second light; a third light-emitting layer over the second light-emitting layer, the third light-emitting layer comprising a third compound and a third host material, wherein the third compound is capable of converting an energy of a triplet excited state of the third compound into a third light; and a second electrode over the third light-emitting layer, wherein the second light is red light, wherein the third light is blue light, and wherein the second light-emitting layer and the third light-emitting layer are in contact with each other. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification