| abstract |
Disclosed are an organic electroluminescence device having at least a light emitting layer between the electrodes consisting of one pair of an anode and a cathode, at least one of which electrodes is transparent or semi-transparent, wherein said light emitting layer comprises a polymeric fluorescent substance which emits a fluorescence in a solid state, is soluble in solvents and comprises at least one kind of repeating unit represented by the following formula (1) and at last one kind of repeating unit represented by the following formula (2) with the number of the formula (1) repeating units being 2-50% of the total number of all the repeating units: n n --Ar.sub.1 -- (1) n n n --Ar.sub.2 -- (2) n n wherein Ar 1 and Ar 2 are each a bifunctional group forming a carbon--carbon bond with each of two adjacent groups, in the chemical structure of Ar 1 , the number of the consecutive atoms present in the shortest path between the two carbon atoms bonding to said two adjacent groups is 1, 3 or 5, and in the chemical structure of Ar 2 , the total number of the carbon and nitrogen atoms present in the shortest path between the two carbon atoms bonding to said two adjacent groups is an even number, and a novel polymeric fluorescent substance used in the above device. |