Luminescent element

Abstract

A light-emitting element is disclosed, 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 has an organic membrane having a larger ionization potential than that of the host material between the light-emitting layer and the cathode, with the organic membrane being in contact with the light-emitting layer: general formula (I) 1 wherein R1, R2, R3, R4 and R5 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-RY1, RY1 represents a hydrogen atom or a substituent, L represents a linking group comprising a conjugated bond, RX and RY 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. The light-emitting element of the invention has a small temperature dependence of response upon pulse driving, and is excellent in red purity, light-emitting efficiency and durabiloity.

Dependencies are inferred from the claim text.