Composition for organic electroluminescent element and organic electroluminescent element comprising same

A composition for an organic electroluminescent element, the composition comprising a first host represented by Chemical Formula 1 below and a second host represented by Chemical Formula 2 below:

• (where, in Chemical Formulas 1 and 2,
• D is deuterium;
• a, d, f, and h are each an integer of 0 to 3;
• b, c, e, g, and i are each an integer of 0 to 4;
• j and k are each an integer of 0 to 5;
• n1 is an integer of 1 to 5;
• n2 is an integer of 0 or 1;
• X1 is selected from the group consisting of O, S, Se, N(Ar3), C(Ar4) (Ar8), and Si(Ar6)(Ar7);
• Y1 and Y2 are the same or different from each other and are each independently N or C(Ar8), provided that at least one of Y1 and Y2 is N;
• Ar1 to Ar8 and R1 to R5 are the same or different from each other and are each independently selected from the group consisting of hydrogen, deuterium (D), a halogen group, a cyano group, a nitro group, an amino group, a C to C40 alkyl group, a C2 to C40 alkenyl group, a C2 to C40 alkynyl group, a C3 to C40 cycloalkyl group, a heterocycloalkyl group having 3 to 40 nuclear atoms, a C6 to C60 aryl group, a heteroaryl group having 5 to 60 nuclear atoms, a C1 to C40 alkyloxy group, a C6 to C60 aryloxy group, a C1 to C40 alkylsilyl group, a C6 to C60 arylsilyl group, a C1 to C40 alkylboron group, a C6 to C60 arylboron group, a phosphine oxide group, a C1 to C40 alkylphosphine oxide group, a C6 to C60 arylphosphine group, a C6 to C60 arylphosphine oxide group, and a C6 to C60 arylamine group, or these groups may form a condensed ring together with an adjacent group;
• and
• the alkyl group, alkenyl group, alkynyl group, cycloalkyl group, heterocycloalkyl group, aryl group, heteroaryl group, alkyloxy group, aryloxy group, alkylsilyl group, arylsilyl group, alkylboron group, arylboron group, alkylphosphine oxide group, arylphosphine group, arylphosphine oxide group, arylamine group, and condensed ring of Ar1 to Ar8 and R1 to R5 are each independently substituted or unsubstituted with at least one substituent selected from the group consisting of deuterium, a halogen, a cyano group, a nitro group, a C2 to C40 alkenyl group, a C2 to C40 alkynyl group, a C3 to C40 cycloalkyl group, a heterocycloalkyl group having 3 to 40 nuclear atoms, a C1 to C40 alkyl group, a C6 to C60 aryl group, a heteroaryl group having 5 to 60 nuclear atoms, a C1 to C40 alkyloxy group, a C6 to C60 aryloxy group, a C1 to C40 alkylsilyl group, a C6 to C60 arylsilyl group, a C1 to C40 alkylboron group, a C6 to C60 arylboron group, a C6 to C60 arylphosphine group, a C6 to C60 arylphosphine oxide group, and a C6 to C60 arylamine group, and when there are multiple substituents, the substituents are the same or different from each other).