18820897. LIGHT-EMITTING DEVICE (SEMICONDUCTOR ENERGY LABORATORY CO., LTD.)
LIGHT-EMITTING DEVICE
Organization Name
SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor(s)
Toshiki Sasaki of Kawasaki (JP)
Shinya Fukuzaki of Atsugi (JP)
LIGHT-EMITTING DEVICE
This abstract first appeared for US patent application 18820897 titled 'LIGHT-EMITTING DEVICE
Original Abstract Submitted
A light-emitting device with a low driving voltage and favorable current efficiency which can be used for a high-resolution display apparatus is provided. A tandem light-emitting device that is fabricated through a photolithography process and includes a plurality of light-emitting units and an intermediate layer between the light-emitting units is provided. The intermediate layer includes a first region including a metal or a metal oxide, a first organic compound including a first π-electron deficient heteroaromatic ring with an electron-donating group, and a second organic compound including a second π-electron deficient heteroaromatic ring. The LUMO level of the second organic compound is lower than that of the first organic compound by greater than or equal to 0.30 eV.