Light emitting element and light emitting device using the element
First Claim
1. A light emitting device comprising:
- a thin film transistor over a substrate, the thin film transistor comprising;
a semiconductor film over the substrate;
an insulating film adjacent to the semiconductor film; and
a gate electrode adjacent to the semiconductor film with the insulating film interposed therebetween;
a first light emitting element having a first light emitting layer including a light emitting organic compound; and
a second light emitting element having a second light emitting layer including a light emitting organic compound,wherein the first light emitting layer and the second light emitting layer are overlapped with each other, andwherein the first light emitting element shows a first emission spectrum having at least two peaks and the second light emitting element shows a second emission spectrum having a peak in a different position from positions of the two peaks.
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Abstract
A first light emitting element 310 and a second light emitting element 320 are serially laminated over a substrate 300. The first light emitting element 310 has a light emitting layer 312 between a first anode 311 and a first cathode 313, and the second light emitting element 320 has a light emitting layer 322 between a second anode 321 and a second cathode 323. Here, the light emitting layer 312 shows a first emission spectrum 330 having peaks both in a blue to blue green wavelength range and in a yellow to orange wavelength range, and the light emitting layer 322 shows a second emission spectrum 340 having peaks both in a blue green to green wavelength range and in an orange to red wavelength range.
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Citations
24 Claims
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1. A light emitting device comprising:
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a thin film transistor over a substrate, the thin film transistor comprising; a semiconductor film over the substrate; an insulating film adjacent to the semiconductor film; and a gate electrode adjacent to the semiconductor film with the insulating film interposed therebetween; a first light emitting element having a first light emitting layer including a light emitting organic compound; and a second light emitting element having a second light emitting layer including a light emitting organic compound, wherein the first light emitting layer and the second light emitting layer are overlapped with each other, and wherein the first light emitting element shows a first emission spectrum having at least two peaks and the second light emitting element shows a second emission spectrum having a peak in a different position from positions of the two peaks. - View Dependent Claims (2, 9, 10, 11, 12, 13, 14)
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3. A light emitting device comprising:
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a thin film transistor over a substrate, the thin film transistor comprising; a semiconductor film over the substrate; an insulating film adjacent to the semiconductor film; and a gate electrode adjacent to the semiconductor film with the insulating film interposed therebetween; a first light emitting element having a first light emitting layer including a light emitting organic compound; and a second light emitting element having a second light emitting layer including a light emitting organic compound, wherein the first light emitting layer and the second light emitting layer are overlapped with each other, and wherein the first light emitting element shows a first emission color including two kinds of emission colors having a complementary color relationship and the second light emitting element shows a second emission color different from the two kinds of emission colors. - View Dependent Claims (4)
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5. A light emitting device comprising:
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a thin film transistor over a substrate, the thin film transistor comprising; a semiconductor film over the substrate; an insulating film adjacent to the semiconductor film; and a gate electrode adjacent to the semiconductor film with the insulating film interposed therebetween; a first light emitting element having a first light emitting layer including a light emitting organic compound; and a second light emitting element having a second light emitting layer including a light emitting organic compound, wherein the first light emitting layer and the second light emitting layer are overlapped with each other, and wherein the first light emitting element shows a first emission spectrum having peaks in a blue to blue green wavelength range and in a yellow to orange wavelength range and the second light emitting element shows a second emission spectrum having a peak in a different position from positions of the peaks. - View Dependent Claims (6)
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7. A light emitting device comprising:
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a thin film transistor over a substrate, the thin fihn transistor comprising; a semiconductor film over the substrate; an insulating film adjacent to the semiconductor film; and a gate electrode adjacent to the semiconductor film with the insulating film interposed therebetween; a first light emitting element having a first light emitting layer including a light emitting organic compound; and a second light emitting element having a second light emitting layer including a light emitting organic compound, wherein the first light emitting layer and the second light emitting layer are overlapped with each other, and wherein the first light emitting element shows a first emission spectrum having peaks in a wavelength range from 430 nm to 480 nm and in a wavelength range from 550 nm to 600 nm and the second light emitting element shows a second emission spectrum having a peak in a different position from positions of the peaks. - View Dependent Claims (8)
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15. A lighting device comprising:
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a first light emitting element having a first light emitting layer including a light emitting organic compound; and a second light emitting element having a second light emitting layer including a light emitting organic compound, wherein the first light emitting layer and the second light emitting layer are overlapped with each other, and wherein the first light emitting layer comprises a third light emitting layer and a fourth light emitting layer which shows a different emission color from an emission color of the third light emitting layer. - View Dependent Claims (16, 17, 18, 21, 22, 23, 24)
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19. A lighting device comprising:
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a first light emitting element having a first light emitting layer including a light emitting organic compound; and a second light emitting element having a second light emitting layer including a light emitting organic compound, wherein the first light emitting layer and the second light emitting layer are overlapped with each other, and wherein the second light emitting layer comprises a fifth light emitting layer and a sixth light emitting layer which shows a different emission color from an emission color of the fifth light emitting layer. - View Dependent Claims (20)
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Specification