Light-Emitting Element

Organization Name

semiconductor energy laboratory co., ltd.

Inventor(s)

Satoko Shitagaki of Isehara JP

Satoshi Seo of Sagamihara JP

Nobuharu Ohsawa of Zama JP

Hideko Inoue of Atsugi JP

Masahiro Takahashi of Atsugi JP

Kunihiko Suzuki of Atsugi JP

Light-Emitting Element

This abstract first appeared for US patent application 20250126962 titled 'Light-Emitting Element

Original Abstract Submitted

provided is a light-emitting element with high external quantum efficiency, or a light-emitting element with a long lifetime. the light-emitting element includes, between a pair of electrodes, a light-emitting layer including a guest material and a host material, in which an emission spectrum of the host material overlaps with an absorption spectrum of the guest material, and phosphorescence is emitted by conversion of an excitation energy of the host material into an excitation energy of the guest material. by using the overlap between the emission spectrum of the host material and the absorption spectrum of the guest material, the energy smoothly transfers from the host material to the guest material, so that the energy transfer efficiency of the light-emitting element is high. accordingly, a light-emitting element with high external quantum efficiency can be achieved.