Organic electroluminescent element and electronic device

4:

• The organic electroluminescence device according to claim 1, wherein a maximum peak wavelength λ1 and a full width at half maximum FWHM1 of a photoluminescence spectrum of the first film, and a maximum peak wavelength λ2 and a full width at half maximum FWHM2 of a photoluminescence spectrum of the second film satisfy numerical formulae (Numerical Formula 20 and Numerical Formula 30) below,
• ❘
• "\[LeftBracketingBar]"
• λ1
• -
• λ2
• ❘
• "\[RightBracketingBar]"
• ≤
• 3
• ⁢
• nm
• (
• Numerical
• ⁢
• Formula
• ⁢
• 20
• )
• ❘
• "\[LeftBracketingBar]"
• FWHM
• ⁢
• 1
• -
• FWHM
• ⁢
• 2
• ❘
• "\[RightBracketingBar]"
• ≤
• 2
• ⁢
• nm
• .
• (
• Numerical
• ⁢
• Formula
• ⁢
• 30
• )

7:

• The organic electroluminescence device according to claim 1, wherein a triplet energy of the first luminescent compound T1(D1) and the triplet energy of the first host material T1(H1) satisfy a relationship of a numerical formula (Numerical Formula 3) below,
• T
• 1
• (
• D
• ⁢
• 1
• )
• >
• T
• 1
• (
• H
• ⁢
• 1
• )
• .
• (
• Numerical
• ⁢
• Formula
• ⁢
• 3
• )

8:

• The organic electroluminescence device according to claim 1, wherein a singlet energy of the first host material S1(H1) and a singlet energy of the first luminescent compound S1(D1) satisfy a relationship of a numerical formula (Numerical Formula 4) below,
• S
• 1
• (
• H
• ⁢
• 1
• )
• >
• S
• 1
• (
• D
• ⁢
• 1
• )
• .
• (
• Numerical
• ⁢
• Formula
• ⁢
• 4
• )

9:

• The organic electroluminescence device according to claim 1, wherein a triplet energy of the second luminescent compound T1(D2) and the triplet energy of the second host material T1(H2) satisfy a relationship of a numerical formula (Numerical Formula 5) below,
• T
• 1
• (
• D
• ⁢
• 2
• )
• >
• T
• 1
• (
• H
• ⁢
• 2
• )
• .
• (
• Numerical
• ⁢
• Formula
• ⁢
• 5
• )

10:

• The organic electroluminescence device according to claim 1, wherein a singlet energy of the second host material S1(H2) and a singlet energy of the second luminescent compound S1(D2) satisfy a relationship of a numerical formula (Numerical Formula 6) below,
• S
• 1
• (
• H
• ⁢
• 2
• )
• >
• S
• 1
• (
• D
• ⁢
• 2
• )
• .
• (
• Numerical
• ⁢
• Formula
• ⁢
• 6
• )

12:

• The organic electroluminescence device according to claim 1, wherein the first luminescent compound and the second luminescent compound are each independently represented by a formula (6) below,
• where, in the formula (6):
• a ring a, a ring b and a ring c are each independently a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocycle having 5 to 50 ring atoms;
• R601 and R602 are each independently bonded with the ring a, the ring b or the ring c to form a substituted or unsubstituted heterocycle, or not bonded therewith to form no substituted or unsubstituted heterocycle;
• and
• R601 and R602 not forming the substituted or unsubstituted heterocycle are each independently a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

13:

• The organic electroluminescence device according to claim 12, wherein
• at least one ring of the ring a, the ring b or the ring c has at least one group represented by —N(R6A)(R6B),
• R6A and R6B are each independently a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms;
• when two or more R6A are present, the two or more R6A are mutually the same or different;
• and
• when two or more R6B are present, the two or more R6B are mutually the same or different.

14:

• The organic electroluminescence device according to claim 1, wherein
• the first host material has, in a molecule, a linking structure including a benzene ring and a naphthalene ring that are linked to each other with a single bond,
• the benzene ring and the naphthalene ring in the linking structure are each independently fused or not fused with a further monocyclic ring or fused ring, and
• the benzene ring and the naphthalene ring in the linking structure are further linked to each other by cross-linking at at least one site other than the single bond.