Light-emitting element, light-emitting device, and electronic device

A light-emitting device comprising:

• an anode;
• a cathode;
• a first light-emitting unit and a second light-emitting unit formed between the anode and the cathode;
• and
• a charge generation layer formed between the first light-emitting unit and the second light-emitting unit,
• wherein the first light-emitting unit comprises:
• a first light-emitting layer formed between the anode and the charge generation layer;
• and
• a first layer for controlling a movement of carriers formed between the first light-emitting layer and the charge generation layer,
• wherein the second light-emitting unit comprises:
• a second light-emitting layer formed between the charge generation layer and the cathode;
• a second layer for controlling a movement of carriers formed between the second light-emitting layer and the cathode,
• wherein each of the first and the second layer for controlling the movement of carriers contains a first organic compound and a second organic compound;
• wherein the first organic compound has an electron transporting property;
• wherein the second organic compound has an electron trapping property;
• and
• wherein a weight percent of the first organic compound is higher than a weight percent of the second organic compound in each of the first and the second layers for controlling the movement of carriers.

A light-emitting device comprising:

• a first electrode;
• a second electrode;
• a first light-emitting unit and a second light-emitting unit formed between the first electrode and the second electrode;
• and
• a charge generation layer formed between the first light-emitting unit and the second light-emitting unit,
• wherein the first light-emitting unit comprises:
• a first light-emitting layer formed between the first electrode and the charge generation layer;
• and
• a first layer for controlling a movement of carriers formed between the first light-emitting layer and the first electrode,
• wherein the second light-emitting unit comprises:
• a second light-emitting layer formed between the charge generation layer and the second electrode;
• a second layer for controlling a movement of carriers formed between the charge generation layer and the second light-emitting layer,
• wherein each of the first and the second layers for controlling the movement of carriers contains a first organic compound and a second organic compound;
• wherein the first organic compound has a hole transporting property;
• wherein the second organic compound has a hole trapping property;
• wherein a weight percent of the first organic compound is higher than a weight percent of the second organic compound in the layer for controlling the movement of carriers;
• and
• wherein each of the first and the second light-emitting layers emits light when a voltage is applied such that a potential of the first electrode is higher than a potential of the second electrode.

A light-emitting device comprising:

• an anode;
• a cathode;
• a first light-emitting unit and a second light-emitting unit formed between the anode and the cathode;
• and
• a charge generation layer formed between the first light-emitting unit and the second light-emitting unit,
• wherein the first light-emitting unit comprises:
• a first light-emitting layer formed between the anode and the charge generation layer;
• and
• a first layer for controlling a movement of carriers formed between the first light-emitting layer and the anode,
• wherein the second light-emitting unit comprises:
• a second light-emitting layer formed between the charge generation layer and the cathode;
• a second layer for controlling a movement of carriers formed between the charge generation layer and the second light-emitting layer,
• wherein each of the first and the second layers for controlling the movement of carriers contains a first organic compound and a second organic compound;
• wherein the first organic compound has a hole transporting property;
• wherein the second organic compound has a hole trapping property;
• and
• wherein a weight percent of the first organic compound is higher than a weight percent of the second organic compound in each of the first and the second layers for controlling the movement of carriers.