Patent ID: 6555959
Filing Date: 2003-04-29
Classification: C07D,C09K,H01L,Y10S

Abstract:
An organic electroluminescent device comprising a pair of electrodes and at least one organic thin layer comprising a light emitting layer between the electrodes, wherein the organic electroluminescent device emits electroluminescence when an electric field is applied across the electrodes wherein electrons and positive holes recombine to produce light in the light emitting layer, and wherein the at least one organic thin layer contains at least one compound represented by the following formula (I), and the at least one compound represented by the following formula (I) emits fluorescence when an electric field is applied across the electrodes: wherein Ar1 and Ar6, which are the same or different, each represents a divalent aryl group or a divalent heterocyclic group; R2, R3, R7 and R8, which are the same or different, each represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group; Ar1, R2 and R3, and Ar6, R7 and R8 may be linked to form a ring; R4a, R5a, R9a and R10a, which are the same or different, each represents a hydrogen atom or a monovalent group, and at least one of R4a, R5a, R9a and R10a represents an electron withdrawing group having a Hammett's &sgr;p value of 0.2 or more; L1 represents (i) a divalent monocyclic or bicyclic aryl group, or a divalent monocyclic or bicyclic aryl group to which a heterocyclic ring is condensed, (ii) a divalent heterocyclic group, or (iii) a divalent group comprising one of two divalent aryl groups, two divalent heterocyclic groups, and a divalent aryl group and a divalent heterocyclic group, which groups are each connected by a single bond, a vinyl group, a C&boxH;X group, a silyl group, an aryl group, a 6-membered aromatic heterocyclic group, a 5-membered aromatic heterocyclic group comprising a carbon atom, a nitrogen atom and an oxygen atom, or the combination of these groups; X represents an oxygen atom, a sulfur atom, Nâ€”Rx1 or CRx2Rx3; and Rx1, Rx2 and Rx3, which are the same or different, each represents a hydrogen atom or a substituent.