LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, LIGHTING DEVICE, AND ELECTRONIC DEVICE

摘要

PURPOSE: A light emitting device, a light emitting apparatus, a lighting device, and an electronic device are provided to reduce power consumption by displaying a white character on a black background. CONSTITUTION: A light emitting device comprises a layer which includes an organic compound between two electrodes. The layer comprises a first monolayer and a second monolayer. The first monolayer comprises a luminescence center material(301) which has fluorescent light emission properties. The second monolayer comprises a host material(300) which has a band gap larger than a band gap of the luminescence center material. A second level is formed with a composite material(302) which has an acceptor material between the electrodes.