Tandem organic light emitting device and method for assembling the same
First Claim
1. A tandem organic light emitting device, consisting:
- (a) an anode;
(b) a cathode;
(c) at least two organic light emitting diode units placed between said anode and said cathode, wherein said organic light emitting diode unit contains the following layers sequentially;
a hole injection layer, a hole transporting layer, an organic light emitting layer, an electron transporting layer and an electron injection layer; and
(d) at least one connecting layer, wherein each connecting layer is placed between said organic light emitting diode units and contacts with said hole injection layer of one of said organic light emitting diode units and said electron injection layer of the other one of said organic light emitting diode units directly;
wherein the material of said hole injection layer and said electron injection layer is a non-doping material having both electron and hole transporting abilities; and
each of said connecting layer consists of aluminum or silver.
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Abstract
The present invention relates to a tandem organic light emitting device, which reduces the driving voltage by using a non-doping material having both the electron transporting and hole transporting abilities to act, respectively, as an electron transporting layer and a hole transporting layer that are in contact with the connecting layer. The tandem organic light emitting device does not have to double its driving voltage as a result of the increasing of the number of the emitting element contained therein. However, the brightness and the current efficiency of the device of the present invention will be higher than the theoretical fold value calculated in accordance with the number of emitting element contained in the device.
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Citations
14 Claims
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1. A tandem organic light emitting device, consisting:
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(a) an anode; (b) a cathode; (c) at least two organic light emitting diode units placed between said anode and said cathode, wherein said organic light emitting diode unit contains the following layers sequentially;
a hole injection layer, a hole transporting layer, an organic light emitting layer, an electron transporting layer and an electron injection layer; and(d) at least one connecting layer, wherein each connecting layer is placed between said organic light emitting diode units and contacts with said hole injection layer of one of said organic light emitting diode units and said electron injection layer of the other one of said organic light emitting diode units directly; wherein the material of said hole injection layer and said electron injection layer is a non-doping material having both electron and hole transporting abilities; and each of said connecting layer consists of aluminum or silver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification