Patent ID: 6663985
Filing Date: 2003-12-16
Classification: H01L,Y10S,Y10T

Abstract:
An organic electroluminescent (EL) device comprising: at least one organic EL multilayer between a top side of a first electrode and a bottom side of a second electrode, and a layer I positioned between said bottom side of said second electrode and a top side of said organic EL multilayer, said layer I including at least one first material from the group consisting of compounds of chemical formula I: where: each of R1 to R4 is independently hydrogen, an alkyl or alkoxy group having from 1 to 5 carbon atoms, aryl, aryloxy or a halogen, or at least one among pairs of adjacent substituents of R1 through R4 form a five or six- numbered conjugated cyclic ring; and, A each independently denotes hydrogen, an alkyl group having from 1 to 5 carbon atoms, or aryl; and further comprising a layer II comprising at least one second material selected from the group consisting of an alkali metal, an alkaline earth metal, and a compound thereof wherein said layer II is positioned between a bottom side of said layer I and a top side of said EL multilayer or wherein said layer II is positioned between a bottom side of said second electrode and a top side of said layer I, wherein the at least one organic EL multilayer comprises a luminescent layer and one or more of a hole injecting layer, a hole transporting layer, an electron transporting layer or an electron injecting layer.