Light-emitting device and light-emitting apparatus

A light-emitting apparatus comprising:

• a first light-emitting device and a second light-emitting device that are adjacent to each other,
• wherein the first light-emitting device comprises a second electrode over a first electrode with a first EL layer between the first electrode and the second electrode,
• wherein the first EL layer comprises at least a first light-emitting layer, a first electron-transport layer, a second electron-transport layer, and a first electron-injection layer,
• wherein the first electron-transport layer is over and in contact with the first light-emitting layer,
• wherein the second electron-transport layer is over and in contact with the first electron-transport layer,
• wherein a first insulating layer includes a part in contact with a side surface of the first light-emitting layer, a side surface of the first electron-transport layer, and a side surface of the second electron-transport layer,
• wherein the first electron-injection layer is over the second electron-transport layer and the first insulating layer,
• wherein the second light-emitting device comprises the second electrode over a third electrode with a second EL layer between the second electrode and the third electrode,
• wherein the second EL layer comprises at least a second light-emitting layer, a third electron-transport layer, a fourth electron-transport layer, and the first electron-injection layer,
• wherein the third electron-transport layer is over and in contact with the second light-emitting layer,
• wherein the fourth electron-transport layer is over and in contact with the third electron-transport layer,
• wherein a second insulating layer includes a first part in contact with a side surface of the second light-emitting layer, a side surface of the third electron-transport layer, and a side surface of the fourth electron-transport layer,
• wherein the first electron-injection layer is over the fourth electron-transport layer and the second insulating layer,
• wherein the first electron-transport layer comprises a first heteroaromatic compound,
• wherein the second electron-transport layer comprises a second heteroaromatic compound that is different from the first heteroaromatic compound,
• wherein each of the first heteroaromatic compound and the second heteroaromatic compound is represented by any one of Structural Formulae (102) to (116), and
• wherein a difference between a crystallization temperature (Tpc) of a powder state and a crystallization temperature (Ttc) of a thin film state of the first heteroaromatic compound is smaller than a difference between a crystallization temperature (Tpc) of a powder state and a crystallization temperature (Ttc) of a thin film state of the second heteroaromatic compound.