Light Emitting Element and Light Emitting Device Using the Element
First Claim
1. A light emitting device comprising:
- a first light emitting element having a first light emitting layer including a light emitting organic compound between a first anode and a first cathode; and
a second light emitting element having a second light emitting layer including a light emitting organic compound between a second anode and a second cathode,wherein the first light emitting element and the second light emitting element are connected in series with the first cathode being in contact with the second anode, andwherein the first light emitting element shows a first 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
An object of the present invention is to provide a high-efficiency white light emitting element having a spectrum in a wide wavelength range. Another object is to provide a white light emitting element in which chromaticity of white color is hard to change over time. Still another object is to provide a white light emitting element in which the shape of an emission spectrum does not tend to depend on current density. 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
13 Claims
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1. A light emitting device comprising:
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a first light emitting element having a first light emitting layer including a light emitting organic compound between a first anode and a first cathode; and a second light emitting element having a second light emitting layer including a light emitting organic compound between a second anode and a second cathode, wherein the first light emitting element and the second light emitting element are connected in series with the first cathode being in contact with the second anode, and wherein the first light emitting element shows a first 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)
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3. A light emitting device comprising:
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a first light emitting element having a first light emitting layer including a light emitting organic compound between a first anode and a first cathode; and a second light emitting element having a second light emitting layer including a light emitting organic compound between a second anode and a second cathode, wherein the first light emitting element and the second light emitting element are connected in series with the first cathode being in contact with the second anode, 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 first light emitting element having a first light emitting layer including a light emitting organic compound between a first anode and a first cathode; and a second light emitting element having a second light emitting layer including a light emitting organic compound between a second anode and a second cathode, wherein the first light emitting element and the second light emitting element are connected in series with the first cathode being in contact with the second anode, 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 first light emitting element having a first light emitting layer including a light emitting organic compound between a first anode and a first cathode; and a second light emitting element having a second light emitting layer including a light emitting organic compound between a second anode and a second cathode, wherein the first light emitting element and the second light emitting element are connected in series with the first cathode being in contact with the second anode, 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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Specification