Patent ID: 7504161
Filing Date: 2009-03-17
Classification: C09B,C09K,H01L,Y10S

Abstract:
1. A light-emitting element, which comprises a substrate having provided thereon a pair of opposed electrodes between which are provided a light-emitting layer containing at least one light-emitting material selected from the compounds represented by the following general formula (I) and a host material, and which comprises an organic membrane having a larger ionization potential than that of the host material between the light-emitting layer and a cathode, the organic membrane being in contact with the light-emitting layer: wherein R 1 , R 3 , R 4 and R 5 may be the same or different from each other and each represents a hydrogen atom or a substituent, X represents an oxygen atom, a sulfur atom or N—R Y1 , R Y1 represents a hydrogen atom or a substituent, L represents a linking group comprising a conjugated bond, R X and R Y may be the same or different from each other and each represents a hydrogen atom or a substituent, with at least one of them being an electron-withdrawing group, wherein the organic membrane comprises at least one compound selected from the compounds represented by the general formula (E 12): wherein, in the general formula (E 12) X