Patent ID: 7125930

Claim:
A block copolymer comprising two or more blocks and having fluorescence in the solid state, in each of the blocks, one or more kinds of repeating unit are bonded through conjugated bonds, and the polystyrene reduced number average molecular weight of at least one block is 1×10 3 to 1×10 8 , wherein the block copolymer is represented by general formula (1a) or (1b) -A-block-(B)-block-C- (1a) (wherein, A and C represent blocks which may be the same or different; B represents a junction unit having a conjugated bond; the fluorescence peak wavelength shown by a thin film of the polymer represented by general formula (1a) is longer by 5 nm or more than the fluorescence peak wavelengths shown by either a thin film of the polymer solely composed of block A, or a thin film of the polymer solely composed of block C), -A-block-C- (1b) (wherein, A and C represent blocks which are mutually different, the fluorescence peak wavelength shown by a thin film of the polymer represented by general formula (1b) is longer by 5 nm or more than the fluorescence peak wavelength shown by a thin film of the polymer solely composed of block A), wherein at least one of A and C which represent blocks in the above formula (1a) or (1b) has one or more kinds of the repeating unit represented by the below formula (3), (wherein, Ar 2 is a divalent aromatic amine group represented by the following general formula (4), R 3 and R 4 each independently represent a group selected from a hydrogen atom, an alkyl group, an aryl group, a monovalent heterocyclic compound group and a cyano group, and m is 0 or 1) (wherein, Ar 3 and Ar 5 are each independently an arylene group, an aromatic compound group represented by the following general formula (5), or a group having an aromatic amine skeleton represented by the following general formula (6), and Ar 4 represents an aryl group, a monovalent heterocyclic compound group, or a group having an aromatic amine skeleton represented by the following general formula (7), or a group having an aromatic ethenylene skeleton represented by the following general formula (8); a ring may be formed between Ar 3 and Ar 4 , between Ar 4 and Ar 5 , or between Ar 3 and Ar 5 ) (wherein, Ar 6 and Ar 7 each independently represent an arylene group, R 5 and R 6 are the same group with those of R 3 and R 4 and 1 is 0 or 1) (wherein, Ar 8 and Ar 9 each independently represent an arylene group, and Ar 10 represent an aryl group, a ring may be formed between Ar 8 and Ar 10 , between Ar 8 and Ar 9 , or between Ar 9 and Ar 10 ) (wherein, Ar 11 represents an arylene group, R 7 and R 8 each independently represent the same group with those of R 3 and R 4 , and a ring may be formed between Ar 11 and R 7 , between Ar 11 and R 8 , or between R 7 and R 8 ) (wherein, Ar 12 and Ar 13 each independently represent an arylene group, R 9 and R 10 each independently represent the same group with those of R 3 and R 4 , and p is 0 or 1).