Light-emitting device, light-emitting apparatus, electronic device, and lighting device

A light-emitting device comprising:

• an anode;
• a cathode;
• and
• an EL layer between the anode and the cathode,
• wherein the EL layer comprises a hole-injection layer, a light-emitting layer, and an electron-transport layer from the anode side,
• wherein the hole-injection layer is in contact with the anode,
• wherein the hole-injection layer comprises a first substance and a second substance,
• wherein the first substance has an electron-accepting property with respect to the second substance,
• wherein the second substance has a HOMO level higher than or equal to −5.7 eV and lower than or equal to −5.4 eV,
• wherein the light-emitting layer comprises a third substance and a fourth substance, the fourth substance being a host material,
• wherein the electron-transport layer comprises a first electron-transport layer and a second electron-transport layer,
• wherein the first electron-transport layer is in contact with the light-emitting layer,
• wherein the first electron-transport layer comprises a fifth substance and a sixth sub stance,
• wherein the second electron-transport layer comprises a seventh substance,
• wherein the fifth substance and the seventh substance are an electron-transport material,
• wherein the sixth substance is a metal, a metal salt, a metal oxide, or a metal complex, and
• wherein a first LUMO level of the fifth substance is lower than a second LUMO level of the fourth substance and a difference between the first LUMO level and the second LUMO level is greater than or equal to 0.15 eV and less than or equal to 0.40 eV.