Light-emitting device, light-emitting apparatus, electronic appliance, and lighting device
A light-emitting device with high heat resistance in a manufacturing process is to be provided. The light-emitting device includes a second electrode over a first electrode with an EL layer sandwiched therebetween; the EL layer includes at least a light-emitting layer, a first electron-transport layer, and a second electron-transport layer; the first electron-transport layer is over the light-emitting layer; the light-emitting device includes an insulating layer in contact with a side surface of the light-emitting layer and a side surface of the first electron-transport layer; the second electron-transport layer is over the first electron-transport layer; the insulating layer is positioned between the second electron-transport layer and the side surface of the light-emitting layer and the side surface of the first electron-transport layer; and the first electron-transport layer contains a heteroaromatic compound including at least one heteroaromatic ring and an organic compound different from the heteroaromatic compound.
1 . A light-emitting device comprising:
a first electrode;
an EL layer over the first electrode;
an insulating layer in contact with at least a part of the EL layer; and
a second electrode over the EL layer and the insulating layer,
wherein the EL layer comprises at least a light-emitting layer, a first electron-transport layer over the light-emitting layer, and a second electron-transport layer over the first electron-transport layer,
wherein the insulating layer is in contact with an end portion of the light-emitting layer and an end portion of the first electron-transport layer,
wherein the second electron-transport layer covers the first electron-transport layer and the insulating layer, and
wherein the first electron-transport layer comprises a first heteroaromatic compound comprising at least one heteroaromatic ring and a first organic compound different from the first heteroaromatic compound.
2 . The light-emitting device according to claim 1 ,
wherein the second electron-transport layer comprises a second heteroaromatic compound comprising at least one heteroaromatic ring.
3 . The light-emitting device according to claim 1 , wherein the first organic compound comprises at least one heteroaromatic ring.
4 . The light-emitting device according to claim 1 , wherein the heteroaromatic ring comprises any one of a pyridine skeleton, a diazine skeleton, a triazine skeleton, and a polyazole skeleton.
5 . The light-emitting device according to claim 1 , wherein the heteroaromatic ring comprises a fused heteroaromatic ring having a fused ring structure.
6 . The light-emitting device according to claim 5 , wherein the fused heteroaromatic ring is any one of a quinoline ring, a benzoquinoline ring, a quinoxaline ring, a dibenzoquinoxaline ring, a quinazoline ring, a benzoquinazoline ring, a dibenzoquinazoline ring, a phenanthroline ring, a furodiazine ring, and a benzimidazole ring.
7 . A light-emitting apparatus comprising:
the light-emitting device according to claim 1 ; and
at least one of a transistor and a substrate.
8 . The light-emitting device according to claim 1 ,
wherein each of the first heteroaromatic compound and the first organic compound is contained in the first electron-transport layer at 10% or higher.
9 . 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 sandwiched therebetween, and a first insulating layer adjacent to a part of the first EL layer,
wherein the first EL layer comprises at least a first light-emitting layer, a first electron-transport layer over the first light-emitting layer, and a second electron-transport layer over the first electron-transport layer,
wherein the first insulating layer is in contact with an end portion of the first light-emitting layer and an end portion of the first electron-transport layer,
wherein the second electron-transport layer covers the first 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 sandwiched therebetween, and a second insulating layer adjacent to a part of the second EL layer,
wherein the second EL layer comprises at least a second light-emitting layer, a third electron-transport layer over the second light-emitting layer, and the second electron-transport layer over the third electron-transport layer,
wherein the second insulating layer is in contact with an end portion of the second light-emitting layer and an end portion of the third electron-transport layer,
wherein the second electron-transport layer covers of the third electron-transport layer and the second insulating layer,
wherein the first electron-transport layer comprises a first heteroaromatic compound comprising at least one heteroaromatic ring and a first organic compound different from the first heteroaromatic compound, and
wherein the third electron-transport layer comprises a second heteroaromatic compound comprising at least one hetero aromatic ring and a second organic compound different from the second heteroaromatic compound.
10 . The light-emitting apparatus according to claim 9 ,
wherein the second electron-transport layer comprises a third heteroaromatic compound comprising at least one heteroaromatic ring.
11 . The light-emitting apparatus comprising claim 9 , wherein each of the first organic compound and the second organic compound comprises at least one heteroaromatic ring.
12 . The light-emitting apparatus according to claim 9 , wherein the heteroaromatic ring comprises any one of a pyridine skeleton, a diazine skeleton, a triazine skeleton, and a polyazole skeleton.
13 . The light-emitting apparatus according to claim 9 , wherein the heteroaromatic ring comprises a fused heteroaromatic ring having a fused ring structure.
14 . The light-emitting apparatus according to claim 13 , wherein the fused heteroaromatic ring is any one of a quinoline ring, a benzoquinoline ring, a quinoxaline ring, a dibenzoquinoxaline ring, a quinazoline ring, a benzoquinazoline ring, a dibenzoquinazoline ring, a phenanthroline ring, a furodiazine ring, and a benzimidazole ring.
15 . The light-emitting apparatus according to claim 9 , wherein the second electron-transport layer is in contact with a top surface of the first electron-transport layer and a top surface of the third electron-transport layer.
16 . An electronic appliance comprising:
the light-emitting apparatus according to claim 9 ; and
at least one of a sensing portion, an input portion, and a communication portion.
17 . A lighting device comprising:
the light-emitting apparatus according to claim 9 ; and
a housing.
18 . The light-emitting apparatus according to claim 9 ,
wherein each of the first heteroaromatic compound and the first organic compound is contained in the first electron-transport layer at 10% or higher, and
wherein each of the second heteroaromatic compound and the second organic compound is contained in the third electron-transport layer at 10% or higher.