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

A light-emitting element comprising:

• a first electrode;
• a second electrode;
• a third electrode;
• and
• an EL layer,
• wherein the EL layer comprises a first region and a second region,
• wherein the first region is positioned between the first electrode and the second electrode,
• wherein the second region is positioned between the second electrode and the third electrode,
• wherein the first region comprises a first injection layer, a first light-emitting layer, and a second light-emitting layer,
• wherein the second region comprises a second injection layer, the first light-emitting layer, and the second light-emitting layer,
• wherein the first injection layer comprises a region in contact with the first electrode,
• wherein the second injection layer comprises a region in contact with the third electrode,
• wherein the first light-emitting layer comprises a first light-emitting material and a first host material,
• wherein the second light-emitting layer comprises a second light-emitting material and a second host material,
• wherein the first light-emitting material has an emission spectrum different from an emission spectrum of the second light-emitting material, and
• wherein a color of light to be emitted from the first region is different from a color of light to be emitted from the second region.

A light-emitting element comprising:

• a first electrode;
• a second electrode;
• a third electrode;
• and
• an EL layer,
• wherein the EL layer comprises a first region and a second region,
• wherein the first region is positioned between the first electrode and the second electrode,
• wherein the second region is positioned between the second electrode and the third electrode,
• wherein the first region comprises a first injection layer, a first light-emitting layer, and a second light-emitting layer,
• wherein the second region comprises a second injection layer, the first light-emitting layer, and the second light-emitting layer,
• wherein the first injection layer comprises a region in contact with the second electrode,
• wherein the second injection layer comprises a region in contact with the second electrode,
• wherein the first light-emitting layer comprises a first light-emitting material and a first host material,
• wherein the second light-emitting layer comprises a second light-emitting material and a second host material,
• wherein the first light-emitting material has an emission spectrum different from an emission spectrum of the second light-emitting material, and
• wherein a color of light to be emitted from the first region is different from a color of light to be emitted from the second region.

A light-emitting element comprising:

• a first electrode;
• a second electrode;
• a third electrode;
• and
• an EL layer,
• wherein the EL layer comprises a first region, a second region, and a third region,
• wherein the first region and the second region are positioned between the first electrode and the second electrode,
• wherein the third region is positioned between the second electrode and the third electrode,
• wherein the first electrode comprises a first conductive film capable of transmitting visible light,
• wherein the third electrode comprises a second conductive film capable of transmitting visible light,
• wherein the first region comprises a first injection layer, a first light-emitting layer, and a second light-emitting layer,
• wherein the second region comprises a second injection layer, the first light-emitting layer, and the second light-emitting layer,
• wherein the third region comprises the second injection layer, the first light-emitting layer, and the second light-emitting layer,
• wherein in the first region, the first injection layer comprises a region in contact with the first electrode,
• wherein in the second region, the second injection layer comprises a region in contact with the first electrode,
• wherein in the third region, the second injection layer comprises a region in contact with the third electrode,
• wherein the first light-emitting layer comprises a first light-emitting material and a first host material,
• wherein the second light-emitting layer comprises a second light-emitting material and a second host material,
• wherein the first light-emitting material has an emission spectrum different from an emission spectrum of the second light-emitting material,
• wherein the second conductive film comprises a region having a larger thickness than the first conductive film,
• wherein the second injection layer comprises a region having a larger thickness than the first injection layer,
• wherein in an emission spectrum of light emitted from the third region, a peak wavelength is longer than a peak wavelength in an emission spectrum of light emitted from the second region, and
• wherein in the emission spectrum of light emitted from the second region, the peak wavelength is longer than a peak wavelength in an emission spectrum of light emitted from the first region.