Organic electroluminescence element and electronic device
AssigneeIdemitsu Kosan Co., Ltd.
InventorsToshinari Ogiwara, Kei Yoshida
Life of this patent
Estimating the term…
Abstract
An organic electroluminescence device includes an anode, a cathode, a first organic layer interposed between the anode and the cathode, a second organic layer interposed between the first organic layer and the cathode, and a bipolar layer interposed between the first organic layer and the second organic layer and having bipolar characteristics, in which at least one of the first organic layer and the second organic layer includes the first compound and the second compound, the first compound exhibits delayed fluorescence, and an energy gap T77K(M2) at 77[K] of the second compound is larger than an energy gap T77K(M1) at 77[K] of the first compound.
Claims26
An organic electroluminescence device comprising:
- an anode;
- a cathode;
- a first organic emitting layer interposed between the anode and the cathode;
- a second organic emitting layer interposed between the first organic emitting layer and the cathode;
- and
- a bipolar layer interposed between the first organic emitting layer and the second organic emitting layer and having bipolar characteristics, wherein
- at least one of the first organic emitting layer and the second organic emitting layer comprises a first compound and a second compound,
- the first compound exhibits delayed fluorescence characteristics,
- an energy gap T77K(M2) at 77[K] of the second compound is larger than an energy gap T77K(M1) at 77[K] of the first compound, and
- the bipolar layer transfers both holes and electrons.
Dependencies are inferred from the claim text.