Light-emitting element, display device, electronic device, and lighting device
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United States of America Patent
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Aug 25, 2020
Grant Date -
Nov 9, 2017
app pub date -
Apr 27, 2017
filing date -
May 6, 2016
priority date (Note) -
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Abstract
A light-emitting element with high luminous efficiency is provided. The light-emitting element contains a first organic compound and a second organic compound. The first and second organic compounds form an exciplex. The first organic compound emits no fluorescence but phosphorescence at a temperature ranging from low temperature to normal temperature. The luminescence quantum yield of the first organic compound is higher than or equal to 0% and lower than or equal to 40% at room temperature. Light emitted from the light-emitting element includes light emitted from an exciplex formed by the first organic compound and the second organic compound.
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