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

A light-emitting device comprising:

• an anode;
• a cathode;
• a light-emitting layer comprising two kinds of organic compounds which are configured to form an exciplex;
• a region comprising an acceptor substance;
• and
• a compound,
• wherein the light-emitting layer is between the anode and the cathode,
• wherein the region comprising the acceptor substance is between the anode and the light-emitting layer,
• wherein the compound is between the light-emitting layer and the region comprising the acceptor substance and represented by General Formula (G0):
• wherein each of Ar1 and Ar2 independently represents a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirofluorenyl group, or a substituted or unsubstituted biphenyl group, and
• wherein Ar3 represents a substituent including a carbazole skeleton.

A light-emitting device comprising:

• an anode;
• a cathode;
• a light-emitting layer comprising three kinds of compounds;
• a region comprising an acceptor substance;
• and
• a compound,
• wherein the light-emitting layer is between the anode and the cathode,
• wherein the region comprising the acceptor substance is positioned between the anode and the light-emitting layer,
• wherein the compound is between the light-emitting layer and the region comprising the acceptor substance and represented by General Formula (G0):
• wherein each of Ar1 and Ar2 independently represents a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirofluorenyl group, or a substituted or unsubstituted biphenyl group, and
• wherein Ar3 represents a substituent including a carbazole skeleton.

A light-emitting device comprising:

• an anode;
• a cathode;
• a light-emitting layer comprising two kinds of organic compounds which are configured to form an exciplex and a phosphorescent compound;
• a region comprising an acceptor substance;
• and
• a compound,
• wherein a difference between an energy value of an emission of the exciplex and an energy of a peak of an absorption band having the lowest wavelength in an absorption spectrum of the phosphorescent compound is 0.2 eV or less,
• wherein the light-emitting layer is between the anode and the cathode,
• wherein the region comprising the acceptor substance is between the anode and the light-emitting layer,
• wherein the compound is between the light-emitting layer and the region comprising the acceptor substance and represented by General Formula (G0):
• wherein each of Ar1 and Ar2 independently represents a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirofluorenyl group, or a substituted or unsubstituted biphenyl group, and
• wherein Ar3 represents a substituent including a carbazole skeleton.

A light-emitting device comprising:

• an anode;
• a cathode;
• a light-emitting layer comprising two kinds of organic compounds which are configured to form an exciplex and a phosphorescent compound;
• a region comprising an acceptor substance;
• and
• a compound,
• wherein a difference between an energy value of an emission of the exciplex and an energy of a peak of an absorption band having the lowest wavelength in an absorption spectrum of the phosphorescent compound is 0.1 eV or less,
• wherein the light-emitting layer is between the anode and the cathode,
• wherein the region comprising the acceptor substance is between the anode and the light- emitting layer,
• wherein the compound is between the light-emitting layer and the region comprising the acceptor substance and represented by General Formula (G0):
• wherein each of Ar1 and Ar2 independently represents a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirofluorenyl group, or a substituted or unsubstituted biphenyl group, and
• wherein Ar3 represents a substituent including a carbazole skeleton.