Light-emitting element and light-emitting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHiroki OHARA
Life of this patent
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Abstract
An object is to provide a highly functional and reliable light-emitting element and light-emitting device with lower power consumption and high emission efficiency. The light-emitting element has an EL layer that has a stacked structure including a light-emitting element containing an organic compound and a functional layer having separate functions between a pair of electrode layers. In the light-emitting element including the functional layer and the light-emitting element containing an organic compound, a mixed-valence compound is contained in the functional layers. When an element in a compound has a plurality of valences, this element is in a state that is referred to as a mixed-valence state and this compound is referred to as a mixed-valence compound.
Claims26
A light-emitting element comprising:
- a light-emitting layer containing an organic compound provided between a first electrode layer and a second electrode layer;
- and
- a functional layer containing a mixed-valence compound on at least one of the first electrode layer side and the second electrode layer side of the light-emitting layer,
- wherein the mixed-valence compound includes a metal element, and the metal element has two or more different valences, and
- wherein the mixed-valence compound includes at least one of vanadium oxide, strontium titanate, magnetic, magnetic ferrite, nickel ferrite, rhenium oxide, europium oxide, lithium titanate, manganese oxide, cobalt oxide, antimony oxide, lead oxide, europium sulfide, copper sulfide, gallium sulfide, thallium sulfide, silver fluoride, indium halide, tantalum chloride, thallium chloride, gallium chloride, indium nitride, tin nitride, tungsten oxide, and molybdenum oxide.
A light-emitting element comprising,
- a first electrode layer, an electron-injecting layer, an electron-transporting layer, a light-emitting layer containing an organic compound, a hole-transporting layer, a hole-injecting layer, and a second electrode layer sequentially stacked;
- and
- a mixed-valence compound contained in at least one of the electron-injecting layer, the electron-transporting layer, the hole-transporting layer, and the hole-injecting layer,
- wherein the mixed-valence compound includes a metal element, and the metal element has two or more different valences, and
- wherein the mixed-valence compound includes at least one of vanadium oxide, strontium titanate, magnetic, magnetic ferrite, nickel ferrite, rhenium oxide, europium oxide, lithium titanate, manganese oxide, cobalt oxide, antimony oxide, lead oxide, europium sulfide, copper sulfide, gallium sulfide, thallium sulfide, silver fluoride, indium halide, tantalum chloride, thallium chloride, gallium chloride, indium nitride, tin nitride, tungsten oxide, and molybdenum oxide.
A light-emitting element comprising:
- a first electrode;
- a first light-emitting unit over the first electrode;
- a charge-generating layer over the first light-emitting unit;
- a second light-emitting unit over the charge-generating layer;
- and
- a second electrode over the second light-emitting unit,
- wherein at least one of the first light-emitting unit and the second light-emitting unit comprises a light-emitting layer containing an organic compound and a functional layer containing a mixed-valence compound, and
- wherein the mixed-valence compound includes a metal element, and the metal element has two or more different valences.
Dependencies are inferred from the claim text.