Light emitting element and light emitting device and method of manufacturing light emitting element

A light emitting device comprising a light emitting element comprising:

• a first electrode;
• a first layer comprising an organic compound and an inorganic compound over the first electrode;
• and
• a second layer comprising a first, second and third regions over the first layer,
• wherein the second region is formed between the first region and the third region,
• wherein each of the first, second and third regions comprises a material having a high light emitting property and a material having a high carrier transporting property,
• wherein a concentration of the material having a high carrier transporting property is higher than a concentration of the material having a high light emitting property in the first and third regions,
• wherein a concentration of the material having a high light emitting property is higher than a concentration of the material having a high carrier transporting property in the second region, and
• wherein the concentration of the material having a high light emitting property periodically changes in the second layer.