发明名称 |
Light-Emitting Element, Light-Emitting Device, Display Device, Electronic Device, and Lighting Device |
摘要 |
A light-emitting element which uses a plurality of kinds of light-emitting dopants emitting light in a balanced manner and has high emission efficiency is provided. Further, a light-emitting device, a display device, an electronic device, and a lighting device each having reduced power consumption by using the above light-emitting element are provided. A light-emitting element which includes a plurality of light-emitting layers including different phosphorescent materials is provided. In the light-emitting element, the light-emitting layer which includes a light-emitting material emitting light with a long wavelength includes two kinds of carrier-transport compounds having properties of transporting carriers with different polarities. Further, in the light-emitting element, the triplet excitation energy of a host material included in the light-emitting layer emitting light with a short wavelength is higher than the triplet excitation energy of at least one of the carrier-transport compounds. |
申请公布号 |
US2014042469(A1) |
申请公布日期 |
2014.02.13 |
申请号 |
US201313961293 |
申请日期 |
2013.08.07 |
申请人 |
SEMICONDUCTOR ENERGY LABORATORY CO., LTD. |
发明人 |
SEO SATOSHI;ISHISONE TAKAHIRO |
分类号 |
H01L33/00 |
主分类号 |
H01L33/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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