Light-emitting device and light-emitting apparatus

A light-emitting device comprising:

• an anode;
• a cathode;
• and
• an EL layer positioned between the anode and the cathode,
• wherein the EL layer comprises a light-emitting layer and a hole-blocking layer,
• wherein the hole-blocking layer is positioned between the light-emitting layer and the cathode,
• wherein the light-emitting layer and the hole-blocking layer are in contact with each other,
• wherein the light-emitting layer comprises a first organic compound and a light-emitting substance,
• wherein the hole-blocking layer comprises a third organic compound,
• wherein the light-emitting substance comprises an organic iridium complex,
• wherein the first organic compound comprises a condensed heteroaromatic ring skeleton comprising a diazine ring, and
• wherein the third organic compound comprises a bicarbazole skeleton and a heteroaromatic ring skeleton comprising one selected from a pyridine ring, a diazine ring, and a triazine ring.

A light-emitting apparatus comprising:

• a first light-emitting device and a second light-emitting device that are adjacent to each other over an insulating surface,
• wherein the first light-emitting device comprises a first anode, a first cathode, and a first EL layer interposed between the first anode and the first cathode,
• wherein the second light-emitting device comprises a second anode, a second cathode, and a second EL layer interposed between the second anode and the second cathode,
• wherein the first EL layer comprises a first light-emitting layer and a hole-blocking layer,
• wherein the hole-blocking layer is positioned between the first light-emitting layer and the first cathode,
• wherein the second EL layer comprises a second light-emitting layer,
• wherein the first light-emitting layer comprises a first organic compound and a first light-emitting substance,
• wherein the hole-blocking layer comprises a third organic compound,
• wherein the second light-emitting layer comprises a second light-emitting substance,
• wherein the first light-emitting substance comprises an organic iridium complex,
• wherein the second light-emitting substance emits light with a peak wavelength different from that of the first light-emitting substance,
• wherein a distance between an end portion of the first light-emitting layer and an end portion of the second light-emitting layer facing each other is greater than or equal to 2 μm and less than or equal to 5 μm,
• wherein the first organic compound comprises a condensed heteroaromatic ring skeleton comprising a diazine ring, and
• wherein the third organic compound comprises a bicarbazole skeleton and a heteroaromatic ring skeleton comprising one selected from a pyridine ring, a diazine ring, and a triazine ring.