Organic electroluminescent device
First Claim
1. An organic EL device comprising:
- an anode, a positive-hole transport layer made of an organic compound, an emitting layer made of an organic compound, and a cathode which are layered in sequence; and
an electron-injecting layer containing at least one of alkaline earth metal oxides and disposed between said emitting layer and said cathode.
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Accused Products
Abstract
An organic electroluminescent device comprises an anode, a positive-hole transport layer made of an organic compound, an emitting layer made of an organic compound, and a cathode which are layered in sequence, further comprising an electron-injecting layer containing at least one of alkaline earth metal oxides and disposed between the emitting layer and the cathode. This device emits light at a high luminance and a high efficiency upon application of a low voltage together with reduction of the decrement of luminance in the running of emitting light of the device. Selection scope for cathode materials is expanded because of the device is free from the restriction of a low work function for the cathode layer. The cathode can be made a transparent electrode such as ITO. Anode and cathode lines may be formed with low resistance material. As a result, emitting efficiency and life time of the device is improved.
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Citations
12 Claims
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1. An organic EL device comprising:
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an anode, a positive-hole transport layer made of an organic compound, an emitting layer made of an organic compound, and a cathode which are layered in sequence; and an electron-injecting layer containing at least one of alkaline earth metal oxides and disposed between said emitting layer and said cathode. - View Dependent Claims (2, 3, 4)
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5. An electroluminescent (EL) device, comprising:
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an anode; a positive-hole transport layer, comprised of an organic compound, disposed adjacent to a surface of the anode; a cathode; an electron-injecting layer, including an alkaline earth metal oxide, disposed adjacent to a first surface of the cathode; and an emitting layer, comprised of an organic compound, disposed between the positive-hole transport layer and the electron-injecting layer. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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Specification