TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The luminescent material is a polymeric luminescent material having structural units of formulae: -(-Ar1-)-, -(-Ar2-N(-R1)-(-Ar3-N(-R2)-)a-Ar4-)- and -(-Ar5-X1-)-.Ar1,Ar5=arylene, heterocyclyl, or bivalent group having metal complex structure;Ar2-Ar4=arylene or bivalent heterocyclyl;R1,R2=H, alkyl, aryl, or monovalent heterocyclyl;X1=-CR3=CR4- or -CC-;R3,R4=H, optionally substituted carboxy, cyano, alkyl, aryl, or monovalent hydrocarbyl;anda=0 or 1.The content of luminescent material in the composition is 0.1-100 parts mass with respect to 1 part mass of high-molecular compound. The number of constitutional sequences in the copolymer is 1-30. Preferred Method: The high-molecular compound is obtained by condensation polymerization for introduction of group (Y'), group (Z), and arbitrary additional group. The molar ratio (NY') of group (Y'), molar ratio (NZ) of group (Z), and molar ratio (NM) of arbitrary additional group satisfy the relation given by, NY'x 100/(NY'+NZ+NM)=30-75. The high-molecular compound and luminescent material are obtained by condensation polymerization for introduction of group (Y'), group (Z), and arbitrary additional group. The molar ratio (NY') of group (Y'), molar ratio (NZ) of group (Z), molar ratio (NM) of arbitrary additional group, and number-of-moles (NL) of chemical structure of luminescent material introduced by condensation polymerization satisfy the relation given by, NY'x 100/(NY'+NZ+NM+NL)=0.5-37.5. The molar ratio (NY') of group (Y'), molar ratio (NZ) of group (Z), molar ratio (NM) of arbitrary additional group, and number-of-moles (NK) of chemical structure in the block type copolymer satisfy the relation given by, NY'x 100/(NY'+NZ+NM+NK) is 2 or more and less than 40. EXAMPLE - In inert atmosphere, (in g) 2-(9,9-bis(3-hexyl-5-methylphenyl)-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-fluoren-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (6.501), 2,7-dibromo-9,9-bis(3-hexylphenyl)-9H-fluorene (4.425), 10-(3,5-bis(3,5-bis(4-t-butylphenyl)phenyl)phenyl)-3,7-dibromo-10H-phenoxazine (1.885), dichlorobis(triphenylphosphine)palladium (6 mg), and toluene (203 mL) were mixed and heated at 105 degrees C. 20 %Mass tetraethylammonium hydroxide aqueous solution (28.5 mL) was dripped in the reaction liquid and refluxed for 3 hours. After reaction, phenylboronic acid (104.7 mg), dichlorobis(triphenylphosphine)palladium (6.1 mg), and 20 %mass tetraethylammonium hydroxide aqueous solution (28.5 mL) were added and refluxed for 16 hours. Sodium diethyldithiacarbamate aqueous solution was added and stirred at 80 degrees C for 2 hours. A deposit was obtained after cooling the obtained mixture by dripping in methanol, filtering, and washing with 3 %mass acetic acid aqueous solution. The deposit was dissolved in toluene, purified, and dried to obtain a polymeric material having a number average molecular weight of 9.3x 104 and a weight average molecular weight of 2.1x 105, by polystyrene conversion. The polymeric material provided an organic electroluminescent element having a light-emission start voltage of 2.9 V, a maximum luminous efficiency of 9.29 cd/A, and a time of 136 hours after which the brightness was reduced to half.