Light-emitting element, light-emitting device, electronic device, and lighting device

摘要

Objects of the present invention are to provide: a light-emitting element having a long lifetime and good emission efficiency and drive voltage. One embodiment of the invention is a light-emitting element including, between an anode (101) and a cathode (102), at least a stack structure in which a first layer (111), a second layer (112), and a light-emitting layer (121) are provided in order from the anode side. The first layer includes a first organic compound and an electron-accepting compound. The second layer includes a second organic compound having a HOMO level differing from the HOMO level of the first organic compound by from -0.2 eV to +0.2 eV. The light-emitting layer includes a third organic compound having a HOMO level differing from the HOMO level of the second organic compound by from -0.2 eV to +0.2 eV and a light-emitting substance having a hole-trapping property with respect to the third organic compound.