Invention Grant
US09379345B2 Light-emitting element, light-emitting device, electronic device, and lighting device 有权
发光元件,发光元件,电子元件及照明器具

Light-emitting element, light-emitting device, electronic device, and lighting device
Abstract:
A light-emitting element with high reliability that can keep favorable characteristics after long-time driving is provided. In addition, a light-emitting device having a long lifetime including the light-emitting element is provided. Moreover, an electronic device and a lighting device having a long lifetime are provided. In a light-emitting element including an EL layer between a pair of electrodes, a light-emitting layer included in the EL layer has a stacked-layer structure which is different from the conventional structure, whereby the light-emitting element can keep favorable characteristics after long-time driving even in the case where carrier balance is changed over time due to driving of the light-emitting element or a light-emitting region is shifted due to the change.
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