Light Emitting Device
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Abstract
An object of the present invention is to provide a light emitting element or a light emitting device that can be formed without any regard for a work function of an electrode. Another object of the invention is to provide a light emitting element or a light emitting device in that the range of choice for a material of an electrode can be widened. In an aspect of the invention, a light emitting device includes first, second and third layers between mutually-facing first and second electrodes. The first layer has a donor level. The second layer is a single layer or a laminated body containing a light emitting substance. The third layer has an acceptor level. When a potential of the second electrode is set higher than that of the first electrode, holes generated in the second layer are injected in the third layer.
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Citations
41 Claims
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1-17. -17. (canceled)
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18. A light emitting device comprising:
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a first electrode, a first layer having a donor level in contact with the first electrode; a laminated body including a layer containing a light emitting substance in contact with the first layer; a second layer having an acceptor level in contact with the laminated body; a third layer having a donor level in contact with the second layer; and a second electrode in contact with the third layer. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A light emitting device comprising:
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a first electrode; a first layer containing a first substance of which an electron mobility is higher than a hole mobility and a second substance that donate an electron to the first substance in contact with the first electrode; a laminated body including a layer containing a light emitting substance in contact with the first layer; a second layer containing a third substance of which a hole mobility is higher than an electron mobility and a fourth substance that accept an electron from the third substance in contact with the laminated body; a third layer containing a fifth substance of which an electron mobility is higher than a hole mobility and a sixth substance that donate an electron to the fifth substance in contact with the second layer; and a second electrode in contact with the third layer. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification