Composition containing borane compound and conjugated polymer compound, and element

A composition comprising:

• a borane compound represented by Formula (B1):
• wherein three ArB1 each independently represent an arylene group optionally having a substituent or a divalent aromatic heterocyclic group optionally having a substituent;
• and three XB1 each independently represent an aromatic amino group optionally having a substituent, a monovalent aromatic heterocyclic group optionally having a substituent, an alkyl group optionally having a substituent, or a hydrogen atom;
• and
• a conjugated polymer compound represented by Formula (P1):
• wherein a structural unit Arp1 represents an arylene group optionally having a substituent, with the proviso that the structural unit Arp1 is different from a structural unit Flup1;
• a structural unit Flup1 represents a fluorenediyl group optionally having a substituent;
• a structural unit Hetp1 represents a divalent aromatic heterocyclic group optionally having a substituent;
• a structural unit Amp1 represents a divalent aromatic amine residue optionally having a substituent;
• nAr, nFlu, nHet and nAm are numbers representing molar ratios in the conjugated polymer compound for the structural unit Arp1, the structural unit Flup1, the structural unit Hetp1 and the structural unit Amp1, respectively, and nAr, nFlu, nHet and nAm are numbers satisfying 0.4≦nFlu≦1, 0 23 nAr≦0.6, 0≦nHet≦0.6 and 0≦nAm≦0.6 when defining nAr+nFlu+nHet+nAm=1;
• polymerization type of the structural unit Arp1, the structural unit Flup1, the structural unit Hetp1 and the structural unit Amp1 in the conjugated polymer compound may be any of alternating polymerization, random polymerization, block polymerization and graft polymerization;
• when the structural unit Arp1 is plurally present, they may be the same as or different from each other;
• when the structural unit Flup1 is plurally present, they may be the same as or different from each other;
• when the structural unit Hetp1 is plurally present, they may be the same as or different from each other;
• and when the structural unit Amp1 is plurally present, they may be the same as or different from each other.