NOVELTY - A composition comprises a luminescent material, and a high-molecular compound (A) having a fused-ring-containing constitutional sequence in the principal chain.    USE - Composition is used for organic layers of organic electroluminescent elements used in planar light sources and display apparatus (all claimed) e.g. curved-surface-form light sources, planar light sources, backlights of LCDs, and LCDs used for computers, televisions, portable terminals, mobile telephones, car navigation systems, and viewfinders of video cameras. Can also be used for organic solar cell materials, organic semiconductors of organic transistors, conductive thin films, and FETs.    ADVANTAGE - The composition has excellent electric current characteristics, and provides organic electroluminescent elements having excellent brightness durability and luminous efficiency. The composition enables easy film-formation.    DETAILED DESCRIPTION - A composition comprises a luminescent material, and a high-molecular compound (A) having a constitutional sequence of formula: -(-(Y')n-Z-)m- in the principal chain.    Y'=bivalent group obtained by removing two hydrogen atoms from structures of formulae (i) and (ii), with hydrogen being optionally substituted by R';    Z=bivalent group obtained by removing two hydrogen atoms from structures of formulae (iii)-(x), with hydrogen being optionally substituted by R';    m=4-10000;    n=1-3;    R'=functional group chosen from carboxy, nitro, cyano, alkyl, alkoxy, alkylthio, aryl, aryloxy, arylthio, alkenyl, alkynyl, amino, silyl, acyl, acyloxy, imine residue, amide compound residue, acid imide residue, monovalent heterocyclyl, and monovalent heterocyclic thio, with hydrogen atom of functional group being optionally substituted, or halo;    two or more R'=ring structure;    X=-CH= or -N=, with number of X as -N= being 0-2;    R'x=functional group chosen from carboxy, nitro, cyano, alkyl, alkoxy, alkylthio, aryl, aryloxy, arylthio, alkenyl, alkynyl, amino, silyl, acyl, acyloxy, imine residue, amide compound residue, acid imide residue, monovalent heterocyclyl, and monovalent heterocyclic thio, with functional group being optionally substituted, H, or halo;and    two or more R'x=ring structure.    INDEPENDENT CLAIMS are included for the following:    (1) high-molecular compound (A), which is a block copolymer; and    (2) organic electroluminescent element consisting of an organic layer provided between a pair of electrodes. The organic layer uses the composition.