Light-emitting element, light-emitting device, lighting device, and electronic device

A light emitting element comprising:

• an anode;
• a first EL layer over the anode;
• a first layer over the first EL layer;
• a second layer over and in contact with the first layer;
• a region including a material having a hole-transporting property and an acceptor material, the region being over and in contact with the second layer;
• a second EL layer over the region;
• and
• a cathode over the second EL layer,
• wherein the first layer includes a material having an electron-transporting property and a donor material, and
• wherein the second layer includes a material having an electron-transporting property.

A light emitting element comprising:

• a first electrode;
• a first EL layer including a first light emitting layer and a second light emitting layer, the first EL layer over the first electrode;
• a first layer over the first EL layer;
• a second layer over and in contact with the first layer;
• a region including a material having a hole-transporting property and an acceptor material, the region over and in contact with the second layer;
• a second EL layer including a third light emitting layer and a fourth light emitting layer, the second EL layer over the region;
• and
• a second electrode over the second EL layer,
• wherein the first layer includes an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, or a rare earth metal compound,
• wherein the second layer includes a material having an electron-transporting property,
• wherein an emission spectrum of the first light emitting layer is different from an emission spectrum of the second light emitting layer, and
• wherein an emission spectrum of the third light emitting layer is different from an emission spectrum of the fourth light emitting layer.

A light emitting element comprising:

• a first electrode;
• a first EL layer including a first light emitting layer and a second light emitting layer, the first EL layer over the first electrode;
• a first layer over the first EL layer;
• a second layer over and in contact with the first layer;
• a region including a material having a hole-transporting property and an acceptor material, the region over and in contact with the second layer;
• a second EL layer including a third light emitting layer and a fourth light emitting layer, the second EL layer over the region;
• and
• a second electrode over the second EL layer,
• wherein the first layer includes a material having an electron-transporting property and a donor material,
• wherein the second layer includes a material having an electron-transporting property,
• wherein an emission spectrum of the first light emitting layer is different from an emission spectrum of the second light emitting layer, and
• wherein an emission spectrum of the third light emitting layer is different from an emission spectrum of the fourth light emitting layer.