Light-emitting element and display device

A light-emitting element comprising:

• an anode electrode;
• a cathode electrode;
• and
• a first hole transport layer, a second hole transport layer, a light-emitting layer, a first electron transport layer, and a second electron transport layer, located between the anode electrode and the cathode electrode, in this order from an anode electrode side,
• wherein, at a highest occupied molecular orbital (HOMO) level, an energy level difference between the second hole transport layer and the light-emitting layer on a second hole transport layer side is from 0.0 eV to 0.15 eV,
• at a lowest unoccupied molecular orbital (LUMO) level, an energy level difference between the first electron transport layer and the light-emitting layer on a first electron transport layer side is from 0.0 eV to 0.15 eV, and
• the second electron transport layer is a mixed layer, including an organic material having electron transport properties and an electron-accepting material, and the electron-accepting material in the mixed layer is in an amount greater than 50 mass %, wherein the light-emitting layer includes:
• a first light-emitting layer of a hole-transporting type on the second hole transport layer side, and a second light-emitting layer of an electron-transporting type on the first electron transport layer side,
• wherein a value obtained by dividing a layer thickness of the second hole transport layer by a total of a layer thickness of the first light-emitting layer and a layer thickness of the second light-emitting layer is greater than 0 and equal to or less than 0.75,
• a value obtained by dividing a layer thickness of the first electron transport layer by the layer thickness of the second hole transport layer is greater than 0 and equal to or less than 0.5, and
• a value obtained by dividing the layer thickness of the first electron transport layer by a total of the layer thickness of the first electron transport layer and a layer thickness of the second electron transport layer is greater than 0 and less than 0.5.