Light emitting device and method of manufacturing the same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsHirokazu Yamagata, Shunpei Yamazaki, Toru Takayama
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Abstract
A high-quality light emitting device is provided which has a long-lasting light emitting element free from the problems of conventional ones because of a structure that allows less degradation, and a method of manufacturing the light emitting device is provided. After a bank is formed, an exposed anode surface is wiped using a PVA (polyvinyl alcohol)-based porous substance or the like to level the surface and remove dusts from the surface. An insulating film is formed between an interlayer insulating film on a TFT and the anode. Alternatively, plasma treatment is performed on the surface of the interlayer insulating film on the TFT for surface modification.
Claims22
A light emitting device comprising:
- an insulating film over a substrate;
- a first electrode over the insulating film;
- a first organic compound layer over the first electrode;
- a second organic compound layer over and in contact with the first organic compound layer;
- and
- a second electrode over the second organic compound layer,
- wherein the first organic compound layer comprises a first region having a first thickness and a second region having a second thickness,
- wherein the first thickness is larger than the second thickness, and
- wherein the second organic compound layer comprises a light emitting layer.
A light emitting device comprising:
- an insulating film over a substrate;
- a first electrode over the insulating film;
- a first organic compound layer comprising polymer organic compound over the first electrode;
- a second organic compound layer over the first organic compound layer;
- and
- a second electrode over the second organic compound layer,
- wherein the second organic compound layer comprises an organic compound having a smaller molecular weight than the polymer organic compound,
- wherein the first organic compound layer comprises a first region having a first thickness and a second region having a second thickness, and
- wherein the first thickness is larger than the second thickness.
A light emitting device comprising:
- an insulating film over a substrate;
- a first electrode over the insulating film;
- a bank covering an edge of the first electrode;
- a first organic compound layer comprising polymer organic compound over the first electrode and the bank;
- a second organic compound layer comprising a light emitting layer over the first organic compound layer;
- and
- a second electrode over the second organic compound layer,
- wherein the second organic compound layer comprises an organic compound having a smaller molecular weight than the polymer organic compound, and
- wherein the first organic compound layer has a curved upper surface at an edge part at which the first electrode and the bank are in contact with each other.
Dependencies are inferred from the claim text.