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US 8,803,853 B2Granted
Light-emitting device and electronic device using the same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsSatoshi Seo, Hajime Kimura, Shunpei Yamazaki
Life of this patent
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Abstract
It is an object to provide a light-emitting device and an electronic device which can provide an image with excellent image quality. One of the present inventions is a light-emitting device including a plurality of light-emitting elements each exhibiting a different emission color. At least one of the plurality of light-emitting elements has n light-emitting layers (n is a natural number, n≧2) between a pair of electrodes. Further, at least one of the n light-emitting layers includes a substance which provides emission from a triplet excitation state. In a light-emitting device having such a structure, an image is displayed by combining emissions from the plurality of light-emitting elements.
Claims23
A light-emitting device comprising:
- a plurality of light-emitting elements each exhibiting a different emission color;
- wherein at least one of the light-emitting elements comprises n light-emitting layers (n≧2, n is a natural number) between a pair of electrodes,
- wherein each of the n light-emitting layers comprises a light-emitting substance,
- wherein the light-emitting substances each exhibit different emission colors,
- wherein between a m-th light-emitting layer (m is a natural number) and a (m+1)-th light-emitting layer, a first mixed layer and a second mixed layer are provided,
- wherein the first mixed layer comprises a first substance and a second substance,
- wherein the first substance comprises a substance having a higher mobility of electrons than that of holes or a bipolar substance,
- wherein the second substance has an electron-donating property to the first substance, and
- wherein the second mixed layer comprises an organic matter and a metal oxide comprising molybdenum or ruthenium.
6 more elements
A light-emitting device comprising:
- a plurality of light-emitting elements each exhibiting a different emission color;
- wherein at least one of the light-emitting elements comprises n light-emitting layers (n≧2, n is a natural number) between a pair of electrodes,
- wherein each of the n light-emitting layers comprises a light-emitting substance,
- wherein the light-emitting substances each exhibit different emission colors,
- wherein at least one of the light-emitting substances exhibits emission from a triplet excited state,
- wherein between a m-th light-emitting layer (m is a natural number) and a (m+1)-th light-emitting later, a first mixed layer and a second mixed layer are provided,
- wherein the first mixed layer comprises a first substance and a second substance,
- wherein the first substance comprises a substance having a higher mobility of electrons than that of holes or a bipolar substance,
- wherein the second substance has an electron-donating property to the first substance, and
- wherein the second mixed layer comprises an organic matter and a metal oxide comprising molybdenum or ruthenium.
7 more elements
A light-emitting device comprising:
- a light-emitting element comprising n light-emitting layers (n≧2, n is a natural number) between a pair of electrodes,
- wherein each of the n light-emitting layers comprises a light-emitting substance,
- wherein the light-emitting substances each exhibit different emission colors,
- wherein between a m-th light-emitting layer (m is a natural number) and a (m+1)-th light-emitting layer, a first mixed layer and a second mixed layer are provided,
- wherein the first mixed layer comprises a first substance and a second substance,
- wherein the first substance comprises a substance having a higher mobility of electrons than that of holes or a bipolar substance,
- wherein the second substance has an electron-donating property to the first substance, and
- wherein the second mixed layer comprises an organic matter and a metal oxide comprising molybdenum or ruthenium.
5 more elements
A light-emitting device comprising:
- a first light-emitting element comprising a light-emitting layer between a first pair of electrodes;
- and
- a second light-emitting element comprising n light-emitting layers (n≧2, n is a natural number) between a second pair of electrodes,
- wherein each of the n light-emitting layers comprises a light-emitting substance,
- wherein the light-emitting substances each exhibit different emission colors,
- wherein between a m-th light-emitting layer (m is a natural number) and a (m+1)-th light-emitting layer of the n light-emitting layers, a mixed layer and a layer are provided,
- wherein the mixed layer comprises a first substance and a second substance,
- wherein the first substance comprises a substance having a higher mobility of electrons than that of holes or a bipolar substance,
- wherein the second substance has an electron-donating property to the first substance,
- wherein the layer comprises an organic matter and a metal oxide comprising molybdenum or ruthenium, and
- wherein one electrode of the first pair of electrodes of the first light-emitting element and one electrode of the second pair of electrodes of the second light-emitting element are provided on a same surface of a substrate with a partition interposed therebetween.
8 more elements
A light-emitting device comprising:
- a first light-emitting element comprising a light-emitting layer between a first pair of electrodes;
- and
- a second light-emitting element comprising n light-emitting layers (n≧2, n is a natural number) between a second pair of electrodes,
- wherein each of the n light-emitting layers comprises a light-emitting substance,
- wherein the light-emitting substances each exhibit different emission colors,
- wherein at least one of the light-emitting substances exhibits emission from a triplet excited state,
- wherein between a m-th light-emitting layer (m is a natural number) and a (m+1)-th light-emitting layer of the n light-emitting layers, a mixed layer and a layer are provided,
- wherein the mixed layer comprises a first substance and a second substance,
- wherein the first substance comprises a substance having a higher mobility of electrons than that of holes or a bipolar substance,
- wherein the second substance has an electron-donating property to the first substance,
- wherein the layer comprises an organic matter and a metal oxide comprising molybdenum or ruthenium, and
- wherein one electrode of the first pair of electrodes of the first light-emitting element and one electrode of the second pair of electrodes of the second light-emitting element are provided on a same surface of a substrate with a partition interposed therebetween.
9 more elements
A light-emitting device comprising:
- a first light-emitting element comprising a light-emitting layer between a first pair of electrodes;
- and
- a second light-emitting element comprising n light-emitting layers (n≧2, n is a natural number) between a second pair of electrodes,
- wherein each of the n light-emitting layers comprises a light-emitting substance,
- wherein the light-emitting substances each exhibit different emission colors,
- wherein between a m-th light-emitting layer (m is a natural number) and a (m+1)-th light-emitting layer of the n light-emitting layers, a first layer and a second layer are provided,
- wherein the first layer comprises a first substance and a second substance,
- wherein the first substance comprises a substance having a higher mobility of electrons than that of holes or a bipolar substance,
- wherein the second substance has an electron-donating property to the first substance,
- wherein the second layer comprises an organic matter and a metal oxide comprising molybdenum or ruthenium, and
- wherein one electrode of the first pair of electrodes of the first light-emitting element and one electrode of the second pair of electrodes of the second light-emitting element are provided on a same surface of a substrate with a partition interposed therebetween.
8 more elements
A light-emitting device comprising:
- a first light-emitting element comprising a light-emitting layer between a first pair of electrodes;
- and
- a second light-emitting element comprising n light-emitting layers (n≧2, n is a natural number) between a second pair of electrodes,
- wherein each of the n light-emitting layers comprises a light-emitting substance,
- wherein the light-emitting substances each exhibit different emission colors,
- wherein at least one of the light-emitting substances exhibits emission from a triplet excited state,
- wherein between a m-th light-emitting layer (m is a natural number) and a (m+1)-th light-emitting layer of the n light-emitting layers, a first layer and a second layer are provided,
- wherein the first layer comprises a first substance and a second substance,
- wherein the first substance comprises a substance having a higher mobility of electrons than that of holes or a bipolar substance,
- wherein the second substance has an electron-donating property to the first substance,
- wherein the second layer comprises an organic matter and a metal oxide comprising molybdenum or ruthenium, and
- wherein one electrode of the first pair of electrodes of the first light-emitting element and one electrode of the second pair of electrodes of the second light-emitting element are provided on a same surface of a substrate with a partition interposed therebetween.
9 more elements
Dependencies are inferred from the claim text.