Patent ID: 6821649
Filing Date: 2004-11-23
Classification: C09K,H01L,Y10S,Y10T

Abstract:
An organic EL device comprising a cathode, an anode, and two or more stacked organic layers therebetween including a light emitting layer, at least two organic layers being formed by coating, whereinthe organic layer disposed contiguous to the cathode is an electron injecting organic layer containing at least one compound selected from organic metal salts and organic metal complexes of a metal having a standard electrode potential of more negative than âˆ’1.8 V at 25Â° C., and formed by coating, and an organic layer containing a high molecular weight EL material is disposed contiguous to the electron injecting organic layer on the cathode side, and formed by coating, wherein the electron injecting organic layer is formed by coating a solution of the at least one compound in a solvent which is selected from the group consisting of (i) a chain compound of 3 to 6 carbon atoms in total, having on the molecule at least one alkoxy group of 1 to 3 carbon atoms, carbonyl group, or ester group of 2 to 3 carbon atoms, and a hydroxyl group at the &agr;- and/or &bgr;-position thereto, (ii) a chain compound of 3 to 6 carbon atoms in total, having on the molecule a dialkylamide group of 2 to 4 carbon atoms, (iii) an ester form of chain compound having 5 to 8 carbon atoms in total, (iv) a carbonate form of chain compound having 4 to 7 carbon atoms in total, and (v) mixtures thereof.