Sealed body, light-emitting module, and method of manufacturing sealed body
摘要
說明書
When voltage higher than the threshold voltage of the light-emitting element is applied between the anode 1101 and the cathode 1102, holes are injected to the EL layer from the anode 1101 side and electrons are injected to the EL layer from the cathode 1102 side. The injected electrons and holes are recombined in the EL layer, so that a light-emitting substance contained in the EL layer emits light.
In this specification, a layer or a stacked body which includes one region where electrons and holes injected from both ends are recombined is referred to as a light-emitting unit. Therefore, it can be said that Structure Example 1 of the light-emitting element includes one light-emitting unit.
A light-emitting unit 1103 may include at least one light-emitting layer containing a light-emitting substance, and may have a structure in which the light-emitting layer and a layer other than the light-emitting layer are stacked. Examples of the layer other than the light-emitting layer include a layer containing a substance having an excellent hole-injection property, a layer containing a substance having an excellent hole-transport property, a layer containing a substance having a poor hole-transport property (a substance which blocks holes), a layer containing a substance having an excellent electron-transport property, a layer containing a substance having an excellent electron-injection property, and a layer containing a substance having a bipolar property (a substance having an excellent electron-transport property and an excellent hole-transport property).
