Naphthalene derivative, material for organic electroluminescence device, and organic electroluminescence device using the same
A naphthalene derivative represented by the following formula (1) is provided. In the formula, Ar 1 to Ar 4 each represent an aromatic hydrocarbon cyclic group having 6 to 18 carbon atoms forming a ring. The aromatic hydrocarbon cyclic group has none of anthracene skeleton, pyrene skeleton, aceanthrylene skeleton and naphthacene skeleton. n, m and l each represent an integer in a range of 1 to 5. p represents an integer in a range of 0 to 5. When n, m, l and p each are 2 or more, a plurality of Ar 1 to Ar 4 may be mutually the same or different.
1. A naphthalene derivative represented by the following formula (1),
where: Ar 1 to Ar 4 each represent an aromatic hydrocarbon cyclic group having 6 to 18 carbon atoms forming a ring, the aromatic hydrocarbon cyclic group having none of anthracene skeleton, pyrene skeleton, aceanthrylene skeleton and naphthacene skeleton;
n, m and l each represent an integer in a range of 1 to 5; p represents an integer in a range of 0 to 5;
when the naphthalene derivative has a structure in which two naphthalene skeletons are consecutively bonded together, the structure of the naphthalene derivative is represented by any one of formulae (1-A), (1-B), (1-C) and (1-D) as follows;
the naphthalene skeletons represented by the formulae (1-A), (1-B) and (1-C) each are allowed to have a substituent(s) at any position(s) or allowed to be unsubstituted;
R in the formula (1-D) represents a substituent, R being allowed to represent a single substituent or plural substituents, the single or plural substituent(s) being allowed to be in any position(s) of the two naphthalene skeletons; when R represents plural substituents, the plural substituents are allowed to be mutually the same or different;
when the naphthalene derivative has a structure in which three naphthalene skeletons are consecutively bonded together, a naphthalene skeleton of the three naphthalene skeletons that is positioned at the center of the structure is tetravalent or more while at least either one of the other naphthalene skeletons of the three naphthalene skeletons that are positioned at ends of the structure is trivalent or more;
when the naphthalene derivative has a structure in which four naphthalene skeletons are consecutively bonded together, at least one of the naphthalene skeletons is tetravalent or more;
when the naphthalene derivative contains a plurality of unsubstituted 9-phenanthrenes, the number of the unsubstituted 9-phenanthrenes is 3 or more; and
when Ar 1 to Ar 4 each represent a phenanthrene skeleton in the naphthalene derivative, the phenanthrene skeleton is monovalent.
2. The naphthalene derivative according to claim 1 , wherein Ar 1 to Ar 4 in the formula (1) each represent a benzene skeleton, a naphthalene skeleton, a fluorene skeleton, a phenanthrene skeleton, a fluoranthene skeleton, a triphenylene skeleton or a chrysene skeleton.
3. The naphthalene derivative according to claim 2 , wherein, when Ar 1 to Ar 4 in the formula (1) each has a substituent, the substituent is selected from the group consisting of an aryl group having 6 to 30 carbon atoms, an alkyl group having 1 to 30 carbon atoms, a cycloalkyl group having 1 to 30 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a cyano group, a silyl group having 3 to 30 carbon atoms and a halogen atom.
4. The naphthalene derivative according to claim 1 , wherein n, m and l in the formula (1) each represent an integer in a range of 1 to 3 while p represents an integer in a range of 0 to 3.
5. An organic electroluminescence device comprising the naphthalene derivative according to claim 1 .
6. The organic electroluminescence device according to claim 5 , further comprising a phosphorescent material.
7. The organic electroluminescence device according to claim 5 , the naphthalene derivative being present in an emitting layer.
8. The naphthalene derivative according to claim 1 , wherein the structure of the naphthalene derivative is represented by formula (1-A).
9. The naphthalene derivative according to claim 1 , wherein the structure of the naphthalene derivative is represented by formula (1-B).
10. The naphthalene derivative according to claim 1 , wherein the structure of the naphthalene derivative is represented by formula (1-C).
11. The naphthalene derivative according to claim 1 , wherein the structure of the naphthalene derivative is represented by formula (1-D).
12. The naphthalene derivative according to claim 1 , wherein the naphthalene derivative has a structure in which three naphthalene skeletons are consecutively bonded together.
13. The naphthalene derivative according to claim 1 , wherein the naphthalene derivative has a structure in which four naphthalene skeletons are consecutively bonded together.
14. The naphthalene derivative according to claim 1 , wherein the naphthalene derivative contains a plurality of unsubstituted 9-phenanthrenes.
15. The naphthalene derivative according to claim 1 , wherein Ar 1 to Ar 4 each represent a phenanthrene skeleton in the naphthalene derivative.