Light emitting device comprising triplet compound in electroluminescent layer
First Claim
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1. A light emitting device comprising:
- a substrate;
a first EL element formed over the substrate for emitting a light of a first color, the first EL element including;
a first pixel electrode; and
a first EL layer comprising a first triplet compound;
a second EL element formed over the substrate for emitting a light of a second color which is different from the first color, the second EL element including;
a second pixel electrode; and
a second EL layer comprising a second triplet compound;
a third EL element formed over the substrate for emitting a light of a third color which is different from the first and second colors, the third EL element including;
a third pixel electrode; and
a third EL layer comprising a third triplet compound over the substrate and a bank over the substrate, the bank covering an edge portion of the first pixel electrode,wherein the first EL layer overlaps with the first pixel electrode with at least a part of the bank interposed therebetween, andwherein at least one of the first, second, and third EL layers comprises a plurality of hole transporting layers.
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Abstract
The luminance of different colors of light emitted from EL elements in a pixel portion of a light emitting device is equalized and the luminance of light emitted from the EL elements is raised. The pixel portion of the light emitting device has EL elements whose EL layers contain triplet compounds and EL elements whose EL layers contain singlet compounds in combination. The luminance of light emitted from the plural EL elements is thus equalized. Furthermore, a hole transporting layer has a laminate structure to thereby cause the EL elements to emit light of higher luminance.
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Citations
30 Claims
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1. A light emitting device comprising:
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a substrate; a first EL element formed over the substrate for emitting a light of a first color, the first EL element including; a first pixel electrode; and a first EL layer comprising a first triplet compound; a second EL element formed over the substrate for emitting a light of a second color which is different from the first color, the second EL element including; a second pixel electrode; and a second EL layer comprising a second triplet compound; a third EL element formed over the substrate for emitting a light of a third color which is different from the first and second colors, the third EL element including; a third pixel electrode; and a third EL layer comprising a third triplet compound over the substrate and a bank over the substrate, the bank covering an edge portion of the first pixel electrode, wherein the first EL layer overlaps with the first pixel electrode with at least a part of the bank interposed therebetween, and wherein at least one of the first, second, and third EL layers comprises a plurality of hole transporting layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light emitting device comprising:
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a first substrate; a second substrate; a flexible printed circuit; a pixel portion including a first thin film transistor over the first substrate; a driver circuit including a second thin film transistor over the second substrate; wherein the pixel portion comprises a first EL element for emitting a light of a first color, a second EL element for emitting a light of a second color, and a third EL element for emitting a light of a third color, wherein the first EL element includes a first pixel electrode and a first EL layer comprising a first triplet compound, wherein an edge portion of the first pixel electrode is covered with a bank, wherein the first EL layer overlaps with the first pixel electrode with at least a part of the bank interposed therebetween, wherein the second EL element comprises a second pixel electrode and a second EL layer comprising a second triplet compound, wherein the third EL element comprises a third pixel electrode and a third EL layer comprising a third triplet compound, wherein the second color is different from the first color, wherein the third color is different from the first and second colors, wherein at least one of the first, second, and third EL layers comprises a plurality of hole transporting layers, and wherein the first substrate and the second substrate are connected through the flexible printed circuit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A light emitting device comprising:
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a substrate; a pixel portion including a first thin film transistor over the substrate; a driver circuit including a second thin film transistor over the substrate; wherein the pixel portion comprises a first EL element for emitting a light of a first color, a second EL element for emitting a light of a second color, and a third EL element for emitting a light of a third color, wherein the first EL element comprises a first pixel electrode and a first EL layer comprising a first triplet compound, wherein an edge portion of the first pixel electrode is covered with a bank, wherein the first EL layer overlaps with is over the first pixel electrode with at least a part of the bank interposed therebetween, wherein the second EL element comprises a second pixel electrode and a second EL layer comprising a second triplet compound, wherein the third EL element comprises a third pixel electrode and a third EL layer comprising a third triplet compound, wherein the second color is different from the first color, wherein the third color is different from the first and second colors, and wherein at least one of the first, second, and third EL layers comprises a plurality of hole transporting layers. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification