Long lifetime Phosphorescent Organic Light Emitting Device (OLED) Structures
First Claim
1. An organic light emitting device, comprising:
- an anode;
a cathode;
an emissive layer disposed between the anode and the cathode, the emissive layer further comprising;
a first organic layer comprising a first phosphorescent material and a first non-emissive material, whereinthe concentration of the first phosphorescent material in the first organic layer is 10-90 wt %; and
the concentration of the first non-emissive material in the first organic layer is 10-90 wt %;
a second organic layer comprising a second phosphorescent material and a second non-emissive material, whereinthe concentration of the second phosphorescent material in the second layer is 3-25 wt %; and
the concentration of the second non-emissive material in the second organic layer is 75-97 wt %;
wherein the concentration of the second phosphorescent material in the second organic layer is lower than the concentration of the first phosphorescent material in the first organic layer; and
wherein the first non-emissive material and the second non-emissive material may be the same material or different materials, and the first phosphorescent material and the second phosphorescent material may be the same material or different materials; and
wherein all organic layers between the first organic layer and the anode do not include any materials containing a group selected from the group consisting of triarylamine, napthyl, tri(N-carbazoyl)triphenylamine, tetraarylamine and carbazole.
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Accused Products
Abstract
An organic light emitting device is provided having an emissive layer with an internal interface. The concentration of a second phosphorescent material in a second organic layer is different from the concentration of a first phosphorescent material in a first organic layer, creating the interface. The materials in the first and second organic layers may be the same or different. In addition to this interface within the emissive layer, the device has one or more features designed to mitigate failure mechanisms which may be associated with electrons or excitons passing from the cathode through the emissive layer to damage organic layers on the anode side of the emissive layer. In addition, devices are provided having an interface within the emissive layer as described above, and a lower energy emissive material on at least one side of the interface.
115 Citations
24 Claims
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1. An organic light emitting device, comprising:
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an anode; a cathode; an emissive layer disposed between the anode and the cathode, the emissive layer further comprising; a first organic layer comprising a first phosphorescent material and a first non-emissive material, wherein the concentration of the first phosphorescent material in the first organic layer is 10-90 wt %; and the concentration of the first non-emissive material in the first organic layer is 10-90 wt %; a second organic layer comprising a second phosphorescent material and a second non-emissive material, wherein the concentration of the second phosphorescent material in the second layer is 3-25 wt %; and the concentration of the second non-emissive material in the second organic layer is 75-97 wt %; wherein the concentration of the second phosphorescent material in the second organic layer is lower than the concentration of the first phosphorescent material in the first organic layer; and wherein the first non-emissive material and the second non-emissive material may be the same material or different materials, and the first phosphorescent material and the second phosphorescent material may be the same material or different materials; and wherein all organic layers between the first organic layer and the anode do not include any materials containing a group selected from the group consisting of triarylamine, napthyl, tri(N-carbazoyl)triphenylamine, tetraarylamine and carbazole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24-73. -73. (canceled)
Specification