Organic electroluminescent elements
First Claim
1. An organic EL element comprising a pair of a hole injecting electrode and an electron injecting electrode sandwiching an organic luminous layer and an organic carrier transport layer placed one on top of the other to have a boundary between the organic luminous layer and the organic carrier transport layer, whereinone of the organic luminous layer and the organic carrier transport layer, whichever is placed closer to the hole injecting electrode, is doped with a first organic material, the first organic material being made of at least one substance, a minimum level of a conducting band of the first organic material being lower than a minimum level of a conducting band of the layer which is doped with the first organic material.
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Abstract
An organic EL element that exhibits excellent durability by reducing the amount of accumulated carriers and curbing degradation by heat generated while the organic EL element is driven. The organic EL element comprises a pair of a hole injecting electrode and an electron injecting electrode sandwiching an organic luminous layer and an organic carrier transport layer placed one on top of the other to have a boundary therebetween, characterized in that either the organic luminous layer or the organic carrier transport layer, whichever is placed closer to the hole injecting electrode, is doped with a first organic material, the first organic material being made of at least one substance, a minimum level of a conducting band of the first organic material being lower than a minimum level of a conducting band of a material forming the layer to be doped with the first organic material, and the other layer which is placed closer to the electron injecting electrode is doped with a second organic material, the second organic material being made of at least one substance, a maximum level of a valence band of the second organic material being higher than a maximum level of a valence band of the other layer to be doped with the second organic material.
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Citations
14 Claims
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1. An organic EL element comprising a pair of a hole injecting electrode and an electron injecting electrode sandwiching an organic luminous layer and an organic carrier transport layer placed one on top of the other to have a boundary between the organic luminous layer and the organic carrier transport layer, wherein
one of the organic luminous layer and the organic carrier transport layer, whichever is placed closer to the hole injecting electrode, is doped with a first organic material, the first organic material being made of at least one substance, a minimum level of a conducting band of the first organic material being lower than a minimum level of a conducting band of the layer which is doped with the first organic material.
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11. An organic EL element comprising a hole injecting electrode, an organic hole transport layer, an organic luminous layer, an organic electron transport layer, and an electron injecting electrode, the organic luminous layer being in contact with the organic hole transport layer to form a first boundary, the organic electron transport layer being in contact with the organic luminous layer to form a second boundary, wherein:
an area where the organic hole transport layer is in contact with the first boundary is doped with a first organic material, the first organic material being made of at least one substance, a minimum level of a conducting band of the first organic material being lower than a minimum level of a conducting band of the organic hole transport layer. - View Dependent Claims (12, 13, 14)
Specification