Light emitting device having fluorescence and phosphoresence compound
First Claim
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1. A light-emitting device comprising:
- a first substrate;
a first light-emitting layer and a second light-emitting layer over the first substrate;
an electrode over the first light-emitting layer and the second light-emitting layer; and
a second substrate over the electrode,wherein the first light-emitting layer comprises a first compound which is able to fluorescence,wherein the second light-emitting layer comprises a second compound which is able to phosphorescence, andwherein colors of light emitted from the first compound and the second compound are different from each other.
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Abstract
There is provided a light emitting device which enables a color display with good color balance. A triplet compound is used for a light emitting layer of an EL element that emits red color, and a singlet compound is used for a light emitting layer of an EL element that emits green color and a light emitting layer of an EL element that emits blue color. Thus, an operation voltage of the EL element emitting red color may be made the same as the EL element emitting green color and the EL element emitting blue color. Accordingly, the color display with good color balance can be realized.
75 Citations
23 Claims
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1. A light-emitting device comprising:
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a first substrate; a first light-emitting layer and a second light-emitting layer over the first substrate; an electrode over the first light-emitting layer and the second light-emitting layer; and a second substrate over the electrode, wherein the first light-emitting layer comprises a first compound which is able to fluorescence, wherein the second light-emitting layer comprises a second compound which is able to phosphorescence, and wherein colors of light emitted from the first compound and the second compound are different from each other. - View Dependent Claims (2, 3, 4, 5)
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6. A light-emitting device comprising:
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a first substrate; a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer over the first substrate; an electrode over the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer; and a second substrate over the electrode, wherein the first light-emitting layer comprises a first compound which is able to fluorescence, wherein the second light-emitting layer comprises a second compound which is able to phosphorescence, wherein the third light-emitting layer comprises a third compound which is able to phosphorescence, and wherein colors of light emitted from the first compound and the second compound are different from each other. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A light-emitting device comprising:
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a first substrate; a pixel portion over the first substrate; a first light-emitting layer and a second light-emitting layer in the pixel portion; an electrode over the first light-emitting layer and the second light-emitting layer; and a second substrate over the electrode, wherein the first light-emitting layer comprises a first compound which is able to fluorescence, wherein the second light-emitting layer comprises a second compound which is able to phosphorescence, wherein colors of light emitted from the first compound and the second compound are different from each other, wherein the first substrate and the second substrate are bonded to each other by a first seal member and a second seal member, and wherein the first seal member surrounds the pixel portion and the second seal member surrounds the first seal member. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A light-emitting device comprising:
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a first substrate; a pixel portion over the first substrate; a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer in the pixel portion; an electrode over the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer; and a second substrate over the electrode, wherein the first light-emitting layer comprises a first compound which is able to fluorescence, wherein the second light-emitting layer comprises a second compound which is able to phosphorescence, wherein the third light-emitting layer comprises a third compound which is able to phosphorescence, and wherein colors of light emitted from the first compound and the second compound are different from each other, wherein the first substrate and the second substrate are bonded to each other by a first seal member and a second seal member, and wherein the first seal member surrounds the pixel portion and the second seal member surrounds the first seal member. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification