Organic compound, light-emitting element, light-emitting device, electronic device, and lighting device
摘要
說明書
It is preferable that the material 131 and the guest material 134 be selected such that the emission peak of the material 131 overlaps with an absorption band on the longest wavelength side (low energy side) of the guest material 134. This makes it possible to provide a light-emitting element with drastically improved emission efficiency.
<<Host material 132>>
Examples of the compound that can be used as the host material 132 are, but not particularly limited to, a zinc- or aluminum-based metal complex, an oxadiazole derivative, a triazole derivative, a benzimidazole derivative, a quinoxaline derivative, a dibenzoquinoxaline derivative, a dibenzothiophene derivative, a dibenzofuran derivative, a pyrimidine derivative, a triazine derivative, a pyridine derivative, a bipyridine derivative, and a phenanthroline derivative. Other examples are an aromatic amine and a carbazole derivative.
Alternatively, as the host material 132, any of the following hole-transport materials and electron-transport materials can be used. In addition, the organic compound of one embodiment of the present invention can be favorably used.
A material having a property of transporting more holes than electrons can be used as the hole-transport material, and a material having a hole mobility of 1×10?6 cm2/Vs or higher is preferable. Specifically, an aromatic amine, a carbazole derivative, an aromatic hydrocarbon, a stilbene derivative, or the like can be used. Furthermore, the hole-transport material may be a high molecular compound.
