Composition, and method for manufacturing organic electroluminescent element

A composition, comprising:

• at least one high-molecular weight charge transport compound having a weight average molecular weight of 10,000 or more and having a crosslinking group;
• at least one low-molecular weight charge transport compound having a molecular weight of 5,000 or less and having a crosslinking group;
• and
• at least one aromatic organic solvent,
• wherein the low-molecular weight charge transport compound is selected from the group consisting of a compound represented by formula (71) below, a compound represented by formula (72) below, a compound represented by formula (73) below, a compound represented by formula (74) below, a compound represented by formula (75) below, a compound represented by formula (1) below, and a compound represented by formula (2) below,
• wherein, in formula (71),
• Ar621 represents a divalent aromatic hydrocarbon group having 6 to 50 carbon atoms and optionally having a substituent;
• R621, R622, R623, and R624 each independently represent a deuterium atom, a halogen atom, a monovalent aromatic hydrocarbon group having 6 to 50 carbon atoms and optionally having a substituent and/or a crosslinking group, or a crosslinking group;
• formula (71) includes at least two crosslinking groups;
• n621, n622, n623, and n624 are each independently an integer of 0 to 4;
• and
• the sum of n621, n622, n623, and n624 is 1 or more,
• wherein, in formula (72),
• Ar611 and Ar612 each independently represent a divalent aromatic hydrocarbon group having 6 to 50 carbon atoms and optionally having a substituent and/or a crosslinking group;
• R611 and R612 are each independently a deuterium atom, a halogen atom, a monovalent aromatic hydrocarbon group having 6 to 50 carbon atoms and optionally having a substituent and/or a crosslinking group, or a crosslinking group;
• G represents a single bond or a divalent aromatic hydrocarbon group having 6 to 50 carbon atoms and optionally having a substituent and/or a crosslinking group;
• the compound represented by formula (72) has at least two crosslinking groups;
• and
• n611 and n612 are each independently an integer of 0 to 4,
• wherein, in formula (73),
• Ar631, Ar632, and Ar633 each independently represent a direct bond or an aromatic hydrocarbon group having 6 to 30 carbon atoms optionally having a monovalent substituent;
• Ar634, Ar635, and Ar636 are each independently a monovalent aromatic hydrocarbon group having 6 to 30 carbon atoms or a monovalent aromatic heterocyclic group having 3 to 24 carbon atoms, and the monovalent aromatic hydrocarbon group and the monovalent aromatic heterocyclic group may each optionally have a substituent or a crosslinking group;
• at least two selected from Ar634, Ar635, and Ar636 each have a crosslinking group;
• n631, n632, and n633 each independently represent an integer of 0 to 3;
• and
• the crosslinking groups included in Ar634, Ar635, and Ar636 are each independently formula (a) or (b) below,
• wherein, in formulas (a) and (b), * represents a position of bonding to Ar634, Ar635, or Ar636,
• wherein, in formula (74),
• Ar641 to Ar649 each independently represent a hydrogen atom, a benzene ring structure optionally having a substituent and/or a crosslinking group, or a structure in which 2 to 10 benzene ring structures each optionally having a substituent and/or a crosslinking group are linked together in a non-branched or branched manner;
• and
• the compound represented by formula (74) has at least two crosslinking groups,
• wherein, in formula (75),
• W's each independently represent CH or N, and at least one W is N;
• Xa1, Ya1, and Za1 each independently represent a divalent aromatic hydrocarbon group having 6 to 30 carbon atoms and optionally having a substituent or a divalent aromatic heterocyclic group having 3 to 30 carbon atoms and optionally having a substituent;
• Xa2, Ya2, and Za2 each independently represent a hydrogen atom, an aromatic hydrocarbon group having 6 to 30 carbon atoms and optionally having a substituent and/or a crosslinking group, an aromatic heterocyclic group having 3 to 30 carbon atoms and optionally having a substituent and/or a crosslinking group, or a crosslinking group;
• n651, n652, and n653 each independently represent an integer of 0 to 6;
• at least one of n651, n652, and n653 is an integer of 1 or more;
• when n651 is 2 or more, a plurality of Xa1's present may be the same or different;
• when n652 is 2 or more, a plurality of Ya1's present may be the same or different;
• when n653 is 2 or more, a plurality of Za1's present may be the same or different;
• at least two of Xa2, Ya2, and Za2 each have a crosslinking group;
• each of four R651's represents a hydrogen atom or a substituent, and the four R651's may be the same or different;
• and
• when n651, n652, or n653 is 0, a corresponding one of Xa2, Ya2, and Za2 is not a hydrogen atom,
• wherein, in formula (1),
• C represents a carbon atom, and H represents a hydrogen atom;
• A's each independently represent a substituent represented by formula (2′) below;
• and
• x represents an integer of 0 to 2,
• wherein, in formula (2′),
• L21's each independently represent a bonding group optionally having a substituent;
• CL21's each independently represent a crosslinking group represented by formula (3) below;
• * represents a direct bond to the carbon atom in formula (1);
• y represents an integer of 1 to 6, and z represents an integer of 0 to 4;
• when z is 0, a hydrogen atom instead of CL21 is bonded to a bonding group L21;
• and
• three or more CL21's are present in the compound represented by formula (1),
• wherein, in formula (3),
• Arom represents an aromatic ring having 3 to 30 carbon atoms and optionally having a substituent;
• R31 and R32 each independently represent a hydrogen atom or an alkyl group;
• * represents a direct bond to L21 in formula (2′), and the direct bond to formula (2′) is bonded to Arom,
• wherein, in formula (2),
• Ar1 and Ar2 each independently represent a divalent aromatic group having 6 to 60 carbon atoms and optionally having a substituent;
• R1, R2, R3, and R4 each independently represent an alkyl group optionally having a substituent or an aromatic group optionally having a substituent;
• R1 and R2, R3's, or R4's may be bonded together to form a ring;
• L1 and L2 each independently represent a crosslinking group;
• n11 and n12 each independently represent an integer of 0 to 5;
• and
• n13 and n14 each independently represent an integer of 0 to 3.