A substance that facilitates hole injection and has high triplet excitation energy is provided. A light-emitting element having high emission efficiency is provided. A light-emitting element driven with a low voltage is provided. Or a light-emitting element having a long lifetime is provided. Provided is a light-emitting element including a triazolo[4,3-f]phenanthridine derivative or a triazolo[3,4-a]isoquinoline derivative. Provided is a triazolo[4,3-f]phenanthridine and triazolo[3,4-a]isoquinoline derivatives, which are novel and can be used for the light-emitting element.
提供了一种促进空穴注入并具有高三重激发能的物质。提供了一种具有高发射效率的发光元件。提供了一种低电压驱动的发光元件。或者提供了一种具有长寿命的发光元件。提供了一种包括三唑并[4,3-f]
菲啶衍
生物或三唑并[3,4-a]
异喹啉衍
生物的发光元件。提供了一种新颖的三唑并[4,3-f]
菲啶和三唑并[3,4-a]
异喹啉衍
生物,可用于发光元件。