Patent ID: 6528188
Filing Date: 2003-03-04
Classification: H01L,Y10S

Abstract:
An organic EL element comprising:an anode; a cathode; and an organic luminescent layer located between the anode and the cathode, the organic luminescent layer including: a hole-transporting luminescent layer that includes a hole-transporting base material doped with a first fluorescent material, which includes at least two different fluorescent substances, such that the hole-transporting layer emits a spectrum of mixed light, wherein the hole-transporting layer is provided with a supply of holes; and an electron-transporting luminescent layer that includes an electron-transporting base material doped with a second fluorescent material, which includes at least two different fluorescent substances, such that the electron-transporting material emits a spectrum of mixed light, wherein the electron-transporting layer is provided with a supply of electrons, and wherein the spectrum of the electron-transporting layer is substantially the same as the spectrum of the hole-transporting layer even if the supply of holes and the supply of electrons become unbalanced, such that the EL has substantially constant chromaticity, and wherein the hole-transporting luminescent layer directly contacts the electron-transporting luminescent layer, and the fluorescent peak wavelengths of the hole-transporting luminescent layer and the electron-transporting luminescent layer under a solid state are in a range of 380 nm to less than 510 nm.