Organic compound, light-emitting element, light-emitting device, electronic device, and lighting device
摘要
說明書
The material 131 preferably has the bicarbazole skeleton that has a strong donor property, in which case a hole that has been injected to the light-emitting layer 130 is easily injected to the material 131 and easily transported. In addition, the material 131 preferably has the benzofuropyrimidine skeleton or the benzothienopyrimidine skeleton that has a strong acceptor property, in which case an electron that has been injected to the light-emitting layer 130 is easily injected to the material 131 and easily transported. In that case, the host material 132 preferably has a donor skeleton whose donor property is weaker than that of the donor skeleton included in the material 131 and an acceptor skeleton whose acceptor property is weaker than that of the acceptor skeleton included in the material 131. With this structure, reaction for forming an exciplex by the material 131 and the host material 132 can be suppressed.
For example, when the HOMO level of the material 131 is higher than that of the host material 132 and the LUMO level of the material 131 is lower than that of the host material 132, both the electron and the hole which are carriers injected to the light-emitting layer 130 are easily injected to the material 131 and easily transported. Thus, the carrier recombination easily occurs in the material 131, which is preferable.
