Patent ID: 8278819

Claim:
An organic electroluminescence device, comprising: a cathode; an anode; and an emitting layer provided between the cathode and the anode, wherein the emitting layer comprises a host and a dopant, the host is a naphthacene derivative represented by formula (3) as follows, and the dopant is a compound having a pyrromethene skeleton represented by formula (2) as follows or a metal complex of the compound of formula (2), wherein Q 10 , Q 21 to Q 25 , Q 31 to Q 35 , Q 40 to Q 80 and Q 110 to Q 140 each represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted heterocyclic group, Q 10 , Q 21 to Q 25 , Q 31 to Q 35 , Q 40 to Q 80 and Q 110 to Q 140 being allowed to be mutually the same or different, adjacent two or more of Q 21 to Q 25 and Q 31 to Q 35 being allowed to be mutually bonded to form a cyclic structure, at least two of Q 21 to Q 25 and at least two of Q 31 to Q 35 represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted heterocyclic group, and at least one of R 15 to R 21 is a substituent having an aromatic ring or forming a condensed ring together with an adjacent substituent while the rest of R 15 to R 21 each represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a mercapto group, an alkoxy group, an alkylthio group, an arylether group, an arylthioether group, an aryl group, a heterocyclic group, halogen, a haloalkane, a haloalkene, a haloalkyne, a cyano group, an aldehyde group, a carbonyl group, a carboxyl group, an ester group, a carbamoyl group, an amino group, a nitro group, a silyl group or a siloxanyl group, the rest of R 15 to R 21 may optionally form a condensed ring or an aliphatic ring with an adjacent substituent, the groups listed above each having 1 to 20 carbon atoms, R 15 to R 21 being allowed to be mutually the sane or different and being allowed to be substituted or unsubstituted; X representing a carbon atom or a nitrogen atom on a condition that R 21 above does not exist when X represents a nitrogen atom; and a metal in the metal complex being at least one metal selected from a group consisting of boron, beryllium, magnesium, chrome, iron, cobalt, nickel, copper, zinc and platinum.