Light-Emitting Element, Light-Emitting Device, and Lighting Device

A light-emitting element comprising:

• a first substrate;
• a first metal electrode over the first substrate, the first metal electrode comprising titanium;
• a conductive metal oxide layer over and in electrical contact with the first metal electrode, the conductive metal oxide layer comprising indium and tin,
• a first light-emitting layer over the conductive metal oxide layer;
• a second light-emitting layer over the first light-emitting layer;
• and
• a second metal electrode over the second light-emitting layer,
• wherein the first metal electrode is configured to function as an anode, and
• wherein an optical path length L between a bottom surface of the conductive metal oxide layer and a bottom surface of the second metal electrode is 650 nm to 1500 nm.

A light-emitting element comprising:

• a first substrate;
• a first metal electrode over the first substrate, the first metal electrode comprising molybdenum;
• a conductive metal oxide layer over and in electrical contact with the first metal electrode, the conductive metal oxide layer comprising indium and tin,
• a first light-emitting layer over the conductive metal oxide layer;
• a second light-emitting layer over the first light-emitting layer;
• and
• a second metal electrode over the second light-emitting layer,
• wherein the first metal electrode is configured to function as an anode, and
• wherein an optical path length L between a bottom surface of the conductive metal oxide layer and a bottom surface of the second metal electrode is 650 nm to 1500 nm.