Light Emitting Element and Light Emitting Device
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Abstract
A light emitting element of the invention includes n pieces of light emitting layers (n is a natural number) between first and second electrodes. A first layer and a second layer are provided between the mth light emitting layer (m is a natural number of 1≦m≦n) and the m+1th light emitting layer. The first and second layers are contacted to each other. The first layer contain a substance that transports holes easily and a substance with an electron accepting property. The second layer contains a substance that transports electrons easily and a substance with an electron donating property. Molybdenum oxide is used as the substance with the electron accepting property.
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Citations
49 Claims
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1-15. -15. (canceled)
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16. A light emitting element comprising:
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n pieces of light emitting layers between a first electrode and a second electrode, wherein n is a natural number larger than 1; and a stacked layer provided between the mth light emitting layer and the m+1th light emitting layer, wherein m is a natural number equal to or larger than 1 and smaller than n, wherein the stacked layer comprises a first layer and a second layer which are in contact with each other, wherein the first layer contains both molybdenum oxide and a substance that transports a hole easily, and wherein the second layer contains both a first substance that transports an electron easily and a second substance that has an electron donating property with respect to the first substance. - View Dependent Claims (17, 18, 19, 20)
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21. A light emitting element comprising:
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a first light emitting layer and a second light emitting layer which are provided between a first electrode and a second electrode; and a stacked layer provided between the first light emitting layer and the second light emitting layer, wherein the stacked layer comprises a first layer and a second layer which are in contact with each other, wherein the first layer contains both molybdenum oxide and a substance that transports a hole easily, and wherein the second layer contains both a first substance that transports an electron easily and a second substance that has an electron donating property with respect to the first substance. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A light emitting element comprising:
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a first light emitting layer formed over a first electrode; a first stacked layer formed over the first light emitting layer; a second light emitting layer formed over the first stacked layer; a second stacked layer formed over the second light emitting layer; a third light emitting layer formed over the second stacked layer; a second electrode formed over the third light emitting layer, wherein the first stacked layer and the second stacked layer each comprise a first layer and a second layer which are in contact with each other, wherein the first layer contains both molybdenum oxide and a substance that transports a hole easily, and wherein the second layer contains both a first substance that transports an electron easily and a second substance that has an electron donating property with respect to the first substance. - View Dependent Claims (28, 29, 30, 31, 32)
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33. A lighting appliance having a light emitting element, the light emitting element comprising:
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n pieces of light emitting layers between a first electrode and a second electrode, wherein n is a natural number larger than 1; and a stacked layer provided between the mth light emitting layer and the m+1th light emitting layer, wherein m is a natural number equal to or larger than 1 and smaller than n, wherein the stacked layer comprises a first layer and a second layer which are in contact with each other, wherein the first layer contains both molybdenum oxide and a substance that transports a hole easily, and wherein the second layer contains both a first substance that transports an electron easily and a second substance that has an electron donating property with respect to the first substance. - View Dependent Claims (34, 35, 36, 37)
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38. A lighting appliance having a light emitting element, the light emitting element comprising:
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a first light emitting layer and a second light emitting layer which are provided between a first electrode and a second electrode; and a stacked layer provided between the first light emitting layer and the second light emitting layer, wherein the stacked layer comprises a first layer and a second layer which are in contact with each other, wherein the first layer contains both molybdenum oxide and a substance that transports a hole easily, and wherein the second layer contains both a first substance that transports an electron easily and a second substance that has an electron donating property with respect to the first substance. - View Dependent Claims (39, 40, 41, 42)
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44. A lighting appliance having a light emitting element, the light emitting element comprising:
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a first light emitting layer formed over a first electrode; a first stacked layer formed over the first light emitting layer; a second light emitting layer formed over the first stacked layer; a second stacked layer formed over the second light emitting layer; a third light emitting layer formed over the second stacked layer; a second electrode formed over the third light emitting layer, wherein the first stacked layer and the second stacked layer each comprise a first layer and a second layer which are in contact with each other, wherein the first layer contains both molybdenum oxide and a substance that transports a hole easily, and wherein the second layer contains both a first substance that transports an electron easily and a second substance that has an electron donating property with respect to the first substance. - View Dependent Claims (45, 46, 47, 48, 49)
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Specification