Organic electroluminescence element, organic electroluminescence display device, and method for producing organic electroluminescence element
AssigneeSharp Kabushiki Kaisha
InventorsManabu Niboshi, Hideki Uchida, Shinji Nakajima, Yoshiyuki Isomura, Eiji Koike, Yuto Tsukamoto, Asae Ito
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Abstract
To provide an organic EL element having good injection properties and transport properties of a carrier. Included are: an InGaZnO layer with a composition rich in In2O3 as a transparent electrode contacting a negative electrode; an InGaZnO layer with a stoichiometric ratio of In:Ga:Zn:O=1:1:1:4 as an electron injecting layer; and an InGaZnO layer with a composition rich in Ga2O3 as an electron transport layer contacting a light emitting layer.
Claims19
An organic electroluminescence element comprising:
- a positive electrode;
- a negative electrode;
- and
- a light emitting layer provided between the positive electrode and the negative electrode;
- wherein
- between either one electrode of the positive electrode or the negative electrode and the light emitting layer, at least a composite metal oxide layer including a first metal oxide layer contacting the one electrode and a second metal oxide layer is formed,
- the first metal oxide layer is composed of a first metal oxide including one or more metal oxides, and the second metal oxide layer is composed of a second metal oxide including one or more metal oxides, and
- one orbital level of a lowest unoccupied molecular orbital level and a highest occupied molecular orbital level of the first metal oxide layer is closer to a work function of the one electrode than one orbital level of the second metal oxide layer.
A method for producing an organic electroluminescence element comprising:
- forming a positive electrode;
- forming a negative electrode;
- and
- forming a light emitting layer between the positive electrode and the negative electrode;
- wherein
- the method further includes forming, between either one electrode of the positive electrode or the negative electrode and the light emitting layer, at least a composite metal oxide layer including a first metal oxide layer contacting the one electrode and a second metal oxide layer,
- in forming the composite metal oxide layer, the first metal oxide layer and the second metal oxide layer are formed such that one orbital level of a lowest unoccupied molecular orbital level and a highest occupied molecular orbital level of the first metal oxide layer composed of a first metal oxide including one or more metal oxides is closer to a work function of the one electrode than one orbital level of the second metal oxide layer composed of a second metal oxide including one or more metal oxides.
Dependencies are inferred from the claim text.