ORGANIC ELECTRIC-FIELD LIGHT-EMITTING ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide an electric-field light-emitting element which can increase light-emitting efficiency by the application of an existing material, emits light stably for a long time and achieves blue light-emission with high brightness and excellent chromaticity. SOLUTION: In a single-hetero-type organic EL element with a structure in which an ITO transparent electrode 5, a hole-transport layer 4, an electron- transport layer 2 and a metallic electrode 1 are laminated in order on a glass substrate 6, between the above hole-transport layer 4 and the electron-transport layer 2, a hole-block layer 33 containing vasophenantroline derivatives expressed by the following general formula 1, concretely for example, is formula 2, ethyl radical is shown as Et is arranged. In this way, the recombination of electron- hole in a hole-transportable light-emitting layer 4b can be promoted.