| 摘要 |
The present invention provides light-emitting element having long lifetime, and light-emitting devices and electronic devices having long lifetime. A light-emitting element comprises a first layer and a second layer including a light-emitting substance between a first electrode and a second electrode. The first layer includes a first organic compound and a second organic compound, the first layer is formed between the second layer and the second electrode, the first layer includes the first organic compound more than the second organic compound, the first organic compound is an organic compound having an electron-transporting property, the second organic compound is an organic compound having an electron-trapping property, an energy gap of the second organic compound is larger than that of the light-emitting substance; and a voltage is applied such that a potential of the first electrode is higher than that of the second electrode, so that the light-emitting layer emits light.
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