LIGHT EMITTING ELEMENT AND LIGHT EMITTING DEVICE AND METHOD OF MANUFACTURING LIGHT EMITTING ELEMENT
First Claim
1. A light emitting device comprising a light emitting element comprising:
- a first electrode;
a first layer comprising an organic compound and an inorganic compound over the first electrode;
a second layer comprising a first, second and third regions over the first layer, wherein the second region is formed between the first region and the third region, wherein the second layer comprises a material having a high light emitting property and a material having a high carrier transporting property, wherein a concentration of the material having a high carrier transporting property is higher than a concentration of the material having a high carrier transporting property in the first and third regions, and wherein a concentration of the material having a high light emitting property is higher than a concentration of the material having a high carrier transporting property in the second region.
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Abstract
It is an object of the present invention to provide a light emitting element with high luminous efficiency, less defects, and low voltage, and a light emitting device having such a light emitting element. It is another object of the invention to provide a method of manufacturing such a light emitting element in simpler manner compared with a conventional manner. A light emitting element of the present invention includes a pair of electrodes, a layer containing a composite material, and a light emitting region; wherein the layer containing a composite material contains an organic compound and an inorganic compound; the light emitting region contains a material having a high light emitting property and a material having a high carrier transporting property, and a region containing high concentration of the material having a high light emitting property and a region containing high concentration of the material having a high carrier transporting property are alternately stacked in the light emitting region.
65 Citations
38 Claims
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1. A light emitting device comprising a light emitting element comprising:
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a first electrode;
a first layer comprising an organic compound and an inorganic compound over the first electrode;
a second layer comprising a first, second and third regions over the first layer, wherein the second region is formed between the first region and the third region, wherein the second layer comprises a material having a high light emitting property and a material having a high carrier transporting property, wherein a concentration of the material having a high carrier transporting property is higher than a concentration of the material having a high carrier transporting property in the first and third regions, and wherein a concentration of the material having a high light emitting property is higher than a concentration of the material having a high carrier transporting property in the second region. - View Dependent Claims (3, 5, 7, 9, 11, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37)
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2. A light emitting device comprising a light emitting element comprising:
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a first electrode;
a first layer comprising an organic compound and an inorganic compound over the first electrode;
a second layer comprising a first, second and third regions, wherein the second layer comprises a material having a high light emitting property and a material having a high carrier transporting property, wherein a concentration of the material having a high carrier transporting property is higher than a concentration of the material having a high carrier transporting property in the first and third regions, and wherein the material having a high light emitting property is dispersed in the material having a high carrier transporting property in the second region. - View Dependent Claims (4, 6, 8, 10, 12, 13, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38)
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Specification