Organic compound, light-emitting element, light-emitting device, electronic device, and lighting device
摘要
說明書
Displays or lighting devices including organic EL elements can be suitably used for a variety of electronic devices as described above; thus, research and development of light-emitting elements have progressed for higher efficiency or longer element lifetimes. In particular, an organic compound is mainly used in an EL layer and greatly affects an improvement in the characteristics of the light-emitting element. For this reason, a variety of novel organic compounds have been developed.
The lifetime and properties of a light-emitting element including an organic compound are greatly affected by the properties of a host material or an electron-transport material in some cases.
As host materials, substances having various skeletons are used. Various bicarbazole compounds have been reported because a bicarbazole compound particularly has a high triplet excitation level (T1 level). Note that it can be said that a light-emitting element using a bicarbazole compound have not sufficiently satisfy advanced requirements for various characteristics including efficiency and durability yet (e.g., Patent Document 1 and Patent Document 2).
[Patent Document 1] Japanese Published Patent Application No. 2014-209611
[Patent Document 2] Japanese Translation of PCT International Application No. 2013-536196
