| abstract |
An object of the present invention is to provide a red electroluminescent device having a high efficiency of using electrical energy and excellent color purity.n n n An object of the present invention is a device in which a substance responsible for luminescence exists between an anode and a cathode and emits light having a peak wavelength of 580 nm or more due to electrical energy, and the fluorescence peak wavelength of the substance responsible for the emission is 540 nm. It is achieved by the electroluminescent element characterized by including the above-mentioned fluorescent compound, the compound which has a pyrromethene frame | skeleton represented by following formula (1), or its metal complex.n n n n n n n n n n Wherein R 1 to R 7 may be the same or different, hydrogen, alkyl group, alkoxy group, halogen group, aryl group, aralkyl group, alkenyl group, arylether group, heterocyclic group, cyano group, aldehyde group, carbonyl group, ester group , a carbamoyl group, is selected from the condensed ring and an aliphatic ring to be formed between the amino group, the adjacent substituents, X is wherein R 7 when the carbon or nitrogen, or nitrogen does not exist. |