| 摘要 |
PURPOSE:To obtain the subject element capable of emitting light with high luminance at a low driving voltage when a voltage is applied between electrodes comprising two conductive layers by a constitution wherein a specified hydrazone compound is present as an organic hole injection transfer substance between the electrodes. CONSTITUTION:An organic electroluminescent element provided with an organic hole injection transfer layer and an organic luminescent layer between electrodes comprising two conductive layers, wherein the organic hole injection transfer layer contains a hydrazone compound of the formula [wherein A is either an aromatic hydrocarbon ring or a monovalent or divalent organic group containing an aromatic heterocyclic ring, and these rings may have substituents; R<1> and R<5> are each H, (substituted) alkyl, aralkyl, an aromatic hydrocarbon group or a heterocyclic group; R<6> and R<7> are each (substituted) alkyl, aralkyl, allyl, an aromatic hydrocarbon group or a heterocyclic group; (l) is 0 or 1; (m) is 0, 1 or 2; (n) is 1 or 2; A, R<1> and a C atom bonded to R<1>, and R<6>, R<7> and an N atom bonded thereto may be combined together respectively to form a ring]. This technique gives an organic electroluminescent element which is capable of emitting light with high luminance at a low driving voltage when a voltage is applied between electrodes comprising two conductive layers and which is free from a decrease in luminance even in long-term storage. |
