Light emitting device including EL elements for emitting lights of different colors
First Claim
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1. A light emitting device comprising:
- a first EL element for emitting a first light; and
a second EL element for emitting a second light,wherein each of the first light and the second light has a different color,wherein the first EL element comprises a triplet compound, andwherein the second EL element comprises a singlet compound.
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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.
88 Citations
30 Claims
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1. A light emitting device comprising:
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a first EL element for emitting a first light; and a second EL element for emitting a second light, wherein each of the first light and the second light has a different color, wherein the first EL element comprises a triplet compound, and wherein the second EL element comprises a singlet compound. - View Dependent Claims (2, 3, 4)
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5. A light emitting device comprising:
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a first pixel for emitting a first light; and a second pixel for emitting a second light, wherein each of the first light and the second light has a different color, wherein each of the first pixel and the second pixel comprises a first thin film transistor, a second thin film transistor electrically connected to the first thin film transistor, and an EL element electrically connected to the second thin film transistor, and wherein the EL element of the first pixel comprises a triplet compound, and wherein the EL element of the second pixel comprises a singlet compound. - View Dependent Claims (6, 7, 8)
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9. A light emitting device comprising:
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a first pixel for emitting a first light; and a second pixel for emitting a second light, wherein each of the first light and the second light has a different color, wherein each of the first pixel and the second pixel comprises a first thin film transistor, a second thin film transistor electrically connected to the first thin film transistor, and an EL element electrically connected to the second thin film transistor, and wherein the EL element of the first pixel comprises a triplet compound, wherein the EL element of the second pixel comprises a singlet compound, wherein the first thin film transistor is an n-channel thin film transistor, and wherein the second thin film transistor is an n-channel thin film transistor. - View Dependent Claims (10, 11, 12)
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13. A light emitting device comprising:
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a first pixel for emitting a first light; and a second pixel for emitting a second light, wherein each of the first light and the second light has a different color, wherein each of the first pixel and the second pixel comprises a first thin film transistor, a second thin film transistor electrically connected to the first thin film transistor, and an EL element electrically connected to the second thin film transistor, and wherein the EL element of the first pixel comprises a triplet compound, wherein the EL element of the second pixel comprises a singlet compound, wherein the first thin film transistor is a p-channel thin film transistor, and wherein the second thin film transistor is a p-channel thin film transistor. - View Dependent Claims (14, 15, 16)
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17. A light emitting device comprising:
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a first pixel for emitting a first light; and a second pixel for emitting a second light, wherein each of the first light and the second light has a different color, wherein each of the first pixel and the second pixel comprises a first thin film transistor, a second thin film transistor electrically connected to the first thin film transistor, and an EL element electrically connected to the second thin film transistor, and wherein the EL element of the first pixel comprises a triplet compound, wherein the EL element of the second pixel comprises a singlet compound, wherein the first thin film transistor is an n-channel thin film transistor, and wherein the second thin film transistor is a p-channel thin film transistor. - View Dependent Claims (18, 19, 20)
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21. A light emitting device comprising:
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a first pixel for emitting a first light; and a second pixel for emitting a second light, wherein each of the first light and the second light has a different color, wherein each of the first pixel and the second pixel comprises a first thin film transistor, a second thin film transistor electrically connected to the first thin film transistor, and an EL element electrically connected to the second thin film transistor, and wherein the EL element of the first pixel comprises a triplet compound, wherein the EL element of the second pixel comprises a singlet compound, wherein the first thin film transistor is a p-channel thin film transistor, and wherein the second thin film transistor is an n-channel thin film transistor. - View Dependent Claims (22, 23, 24)
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25. A light emitting device comprising:
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a first EL element for emitting a first light; and a second EL element for emitting a second light, wherein each of the first light and the second light has a different color, wherein the first EL element comprises a first light emitting layer including a triplet compound and a carrier injecting layer adjacent to the first light emitting layer, and wherein the second EL element comprises a second light emitting layer including a singlet compound and the carrier injecting layer adjacent to the second light emitting layer. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification