Light-emitting material, light-emitting element, light-emitting device, and electronic appliance

A light-emitting device comprising:

• a first electrode;
• a second electrode;
• and
• a light-emitting layer formed between the first electrode and the second electrode,
• wherein the light-emitting layer comprises a base material, a first impurity for forming a shallow donor level in the base material, a second impurity for forming a shallow acceptor level in the base material, and a third impurity for forming a deep trap level between the shallow donor level and the shallow acceptor level, and
• wherein the base material comprises a compound comprising a first element of Group 16 in the periodic table and at least a second element selected from the group consisting of elements of Group 2 and Group 12 in the periodic table.

A light-emitting device comprising:

• a first electrode;
• a second electrode;
• a light-emitting layer formed between the first electrode and the second electrode,
• a insulating layer formed between the light-emitting layer and one of the first and second electrodes
• wherein the light-emitting layer comprises a base material, a first impurity for forming a shallow donor level in the base material, a second impurity for forming a shallow acceptor level in the base material, and a third impurity for forming a deep trap level between the shallow donor level and the shallow acceptor level, and
• wherein the base material comprises a compound comprising a first element of Group 16 in the periodic table and at least a second element selected from the group consisting of elements of Group 2 and Group 12 in the periodic table.