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

A light-emitting device comprising:

• a first electrode;
• a first light-emitting layer over the first electrode;
• a first layer over the first light-emitting layer;
• a second layer over the first layer;
• a third layer over the second layer;
• a second light-emitting layer over the third layer;
• and
• a second electrode over the second light-emitting layer,
• wherein the first layer comprises a first organic compound and a first substance,
• wherein the second layer comprises a second organic compound,
• wherein the third layer comprises a second substance,
• wherein the first organic compound and the second organic compound each independently comprise any of an anthracene derivative, a tetracene derivative, a phenanthrene derivative, a pyrene derivative, a chrysene derivative, a dibenzo[g,p]chrysene derivative, a zinc -or aluminum-based metal complex, an oxadiazole derivative, a triazole derivative, a benzimidazole derivative, a quinoxaline derivative, a dibenzoquinoxaline derivative, a phenanthroline derivative, a pyrimidine derivative, a triazine derivative, and a pyridine derivative,
• wherein the first substance is a metal, a metallic salt, a metal oxide, or an organometallic salt,
• wherein the second substance is an electron-injection material, and
• wherein the second substance is different from the first substance.

A light-emitting device comprising:

• a first electrode;
• a hole-injection layer over the first electrode;
• a first light-emitting layer over the first electrode;
• a first layer over the first light-emitting layer;
• a second layer over the first layer;
• a third layer over the second layer;
• a second light-emitting layer over the third layer;
• and
• a second electrode over the second light-emitting layer,
• wherein the hole-injection layer comprises a first compound and a second compound,
• wherein the first compound has an electron-accepting property with respect to the second compound,
• wherein the second compound has a HOMO level higher than or equal to −5.7 eV and lower than or equal to −5.4 eV,
• wherein the first layer comprises a first organic compound and a first substance,
• wherein the second layer comprises a second organic compound,
• wherein the third layer comprises a second substance,
• wherein the first organic compound and the second organic compound each independently comprise any of an anthracene derivative, a tetracene derivative, a phenanthrene derivative, a pyrene derivative, a chrysene derivative, a dibenzo[g,p]chrysene derivative, a zinc -or aluminum-based metal complex, an oxadiazole derivative, a triazole derivative, a benzimidazole derivative, a quinoxaline derivative, a dibenzoquinoxaline derivative, a phenanthroline derivative, a pyrimidine derivative, a triazine derivative, and a pyridine derivative,
• wherein the first substance is a metal, a metallic salt, a metal oxide, or an organometallic salt,
• wherein the second substance is an electron-injection material, and
• wherein the second substance is different from the first substance.