El element

Abstract

Abstract PURPOSE:To provide an EL element having high luminance and long service life, and composed of a luminescent layer having double-layered structure, wherein each layer is composed of a thin film made of an oriented electroluminescent organic compound molecule having relatively different electronegativity from the other adjacent layer. CONSTITUTION:The objective EL element is composed of a double-layered luminescent layer 2 and a pair of electrode layers 1, 3 sandwiching said luminescent layer, wherein at least one of the electrode layers is transparent. The first luminescent layer is made of a mixed monomolecular film (or its built-up film) composed of a mixture of (i) an electroluminescent organic compound having higher electron affinity than the second layer and (ii) an electron donative organic compound having higher electron donative property than the above compound. The second luminescent layer is made of a mixed monomolecular film (or its built-up film) composed of a mixture of (iii) an electroluminescent organic compound having higher electron donative property than the first layer and (iv) an organic compound having higher electron affinity than the above compound.

Inventors

• 👤 Takeshi Eguchi
• 👤 健 江口
• 👤 Harunori Kawada
• 👤 河田　春紀
• 👤 Yukio Nishimura
• 👤 征生 西村

Bibliographic Details