Organic electroluminescence display device
View Patent ↗The invention provides an organic electroluminescence display device that makes it possible to obtain a highly reliable display. The organic electroluminescence display device has an organic electroluminescence element that includes a first layer ( 3 ) that contains a first substance that exhibits electron transport properties, and a second substance that exhibits electron-donating properties with respect to the first substance; a second layer ( 4 ) that is composed of a third substance that exhibits hole transport properties; a third layer (light-emitting layer ( 5 ) that contains a light-emitting substance; and a fourth layer ( 6 ) that is formed from a substance that exhibits electron transport properties.
1. An organic electroluminescence display device having an organic electroluminescence element that is provided with an anode electrode, an organic electroluminescence layer having at least a four-layer structure formed on the anode electrode, and a cathode electrode formed on the organic electroluminescence layer, the organic electroluminescence element comprising:
a first layer that is in direct contact with the anode electrode and contains a first substance that exhibits electron transport properties, and a second substance that exhibits electron-donating properties with respect to the first substance;
a second layer that is in contact with the first layer and contains a third substance that exhibits hole transport properties;
a third layer that is in contact with the second layer and contains a light-emitting substance;
a fourth layer that is in direct contact with the third layer and contains a substance that exhibits electron transport properties; and
a fifth layer disposed between the cathode electrode and the fourth layer and containing a same substance as the first layer.
2. The organic electroluminescence display device of claim 1 , wherein the fifth layer contains an element of the first group of the periodic table, and wherein the fifth layer is disposed between the cathode electrode and the fourth layer.
3. The organic electroluminescence display device of claim 1 , wherein the fifth layer contains an element of the second group of the periodic table, and wherein the fifth layer is disposed between the cathode electrode and the fourth layer.
4. The organic electroluminescence display device of claim 1 , wherein the anode electrode is in contact with an insulating substrate.
5. The organic electroluminescence display device of claim 1 , wherein the cathode electrode is in contact with an insulating substrate.
6. The organic electroluminescence display device of claim 1 , wherein at least one electrode among the anode electrode and the cathode electrode is formed using a transparent conductive substance.