Light-emitting element, light-emitting device, electronic device, lighting device, and organic compound
摘要
說明書
In this embodiment, the first electrode 401 functions as an anode, and the second electrode 404 functions as a cathode. The first electrode 401 and the second electrode 404 can have structures similar to those described in Embodiment 1. All or any of the plurality of EL layers (the first EL layer 402(1) and the second EL layer 402(2)) may have structures similar to those described in Embodiment 1. In other words, the structures of the first EL layer 402(1) and the second EL layer 402(2) may be the same or different from each other and can be similar to those described in Embodiment 1. The dibenzo[f,h]quinoxaline derivative described in Embodiment 2 can be used for any of the plurality of EL layers (the first EL layer 402(1) and the second EL layer 402(2)).
A charge-generation layer 405 is provided between the plurality of EL layers (the first EL layer 402(1) and the second EL layer 402(2)). The charge-generation layer 405 has a function of injecting electrons into one of the EL layers and injecting holes into the other of the EL layers when a voltage is applied between the first electrode 401 and the second electrode 404. In this embodiment, when a voltage is applied such that the potential of the first electrode 401 is higher than that of the second electrode 404, the charge-generation layer 405 injects electrons into the first EL layer 402(1) and injects holes into the second EL layer 402(2).
