LIGHT-EMITTING MATERIAL, LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, AND ELECTRONIC APPLIANCE

摘要

The present invention is to provide a novel light-emitting material, a light-emitting element capable of low-voltage driving, and light-emitting device and electronic appliance with lower power consumption. Moreover, the present invention is to provide light-emitting device and electronic appliance manufactured at low cost. The light-emitting material includes a base material, a first impurity, a second impurity, and a third impurity. The first impurity forms a shallow donor level in the base material, the second impurity forms a shallow acceptor level in the base material, and the third impurity forms a shallow trap level in the base material. The base material includes a compound including an element of Group 2 in the periodic table and an element of Group 16 in the periodic table. Light is emitted by recombination of an electron at the shallow donor level and a hole at the deep trap level.