Light-emitting device comprising light-emitting layers
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United States of America Patent
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Jan 23, 2018
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app pub date -
Jun 15, 2016
filing date -
Nov 29, 2012
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Abstract
A light-emitting element at least includes a first electrode, a first light-emitting layer over the first electrode, a second light-emitting layer over and in contact with the first light-emitting layer, a third light-emitting layer over and in contact with the first light-emitting layer, and a second electrode over the third light-emitting layer. Each of the first light-emitting layer and the second light-emitting layer contains a phosphorescent compound. The third light-emitting layer contains a fluorescent compound. Each of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer includes an organic compound.
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