TANDEM OLEDS HAVING LOW DRIVE VOLTAGE
First Claim
1. A tandem OLED comprising:
- a) an anode;
b) a cathode;
c) at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-injecting layer, one hole-transporting layer, one organic light-emitting layer, one electron-transporting layer, and one electron-injecting layer;
d) at least one intermediate connector, wherein each of the intermediate connectors includes at least one layer, and wherein each of the intermediate connectors is disposed between electroluminescent units; and
e) wherein the thickness of each layer in each of the electroluminescent units and the intermediate connectors is selected to provide high luminous efficiency using optical out-coupling while satisfying the test condition that the voltage drop from the anode to the cathode is less than 4.0 V×
N (the number of electroluminescent units) at 20 mA/cm2.
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Accused Products
Abstract
A tandem OLED includes an anode, a cathode, and at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-injecting layer, one hole-transporting layer, one organic light-emitting layer, one electron-transporting layer, and one electron-injecting layer. The OLED also includes at least one intermediate connector, wherein each of the intermediate connectors includes at least one layer, and wherein each of the intermediate connectors is disposed between electroluminescent units, wherein the thickness of each layer in each of the electroluminescent units and the intermediate connectors is selected to satisfy the test condition that the voltage drop from the anode to the cathode is less than 4.0 V×N (the number of electroluminescent units) at 20 mA/cm2.
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Citations
20 Claims
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1. A tandem OLED comprising:
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a) an anode;
b) a cathode;
c) at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-injecting layer, one hole-transporting layer, one organic light-emitting layer, one electron-transporting layer, and one electron-injecting layer;
d) at least one intermediate connector, wherein each of the intermediate connectors includes at least one layer, and wherein each of the intermediate connectors is disposed between electroluminescent units; and
e) wherein the thickness of each layer in each of the electroluminescent units and the intermediate connectors is selected to provide high luminous efficiency using optical out-coupling while satisfying the test condition that the voltage drop from the anode to the cathode is less than 4.0 V×
N (the number of electroluminescent units) at 20 mA/cm2. - View Dependent Claims (2, 3, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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4. The tandem OLED of claim I wherein the hole-transporting layer in contact with the organic light-emitting layer in each of the electroluminescent units has a thickness of less than or equal to 5 nm, wherein the organic light-emitting layer in each of the electroluminescent units has a thickness of less than or equal to 15 nm, wherein the electron-transporting layer in contact with the organic light-emitting layer in each of the electroluminescent units has a thickness of less than or equal to 5 nm, and wherein each of the layers in each of the intermediate connectors has a thickness of less than or equal to 3 nm.
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5. A tandem OLED comprising:
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a) an anode;
b) a cathode;
c) at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-injecting layer, one hole-transporting layer, one organic light-emitting layer, one electron-transporting layer, and one electron-injecting layer;
d) at least one intermediate connector, wherein each of the intermediate connectors includes at least one layer, and wherein each of the intermediate connectors is disposed between electroluminescent units; and
e) wherein the thickness of each layer in each of the electroluminescent units and the intermediate connectors is selected to provide high luminous efficiency using optical out-coupling while satisfying the test condition that the voltage drop from the anode to the cathode is less than 3.5 V×
N at 1000 cd/m2. - View Dependent Claims (6, 7, 8)
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Specification