Light-emitting element, light-emitting device, electronic device, and lighting device
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United States of America Patent
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Mar 7, 2017
Grant Date -
Jun 9, 2016
app pub date -
Feb 11, 2016
filing date -
Feb 11, 2016
priority date (Note) -
Withdrawn
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Abstract
A light-emitting element having high external quantum efficiency is provided. A light-emitting element having a long lifetime is provided. A light-emitting element includes a light-emitting layer between a pair of electrodes. The light-emitting layer contains at least a phosphorescent compound, a first organic compound (host material) having an electron-transport property, and a second organic compound (assist material) having a hole-transport property. The light-emitting layer has a stacked-layer structure including a first light-emitting layer and a second light-emitting layer, and the first light-emitting layer contains a higher proportion of the second organic compound than the second light-emitting layer. In the light-emitting layer (the first light-emitting layer and the second light-emitting layer), a combination of the first organic compound and the second organic compound forms an exciplex.
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