Patent ID: 8450727

Claim:
An organic luminescent medium, comprising: a diaminopyrene derivative represented by formula (1-1) wherein Ar 1 to Ar 4 each independently represent a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, provided that one or more of Ar 1 to Ar4 each represent an α-naphthyl group; and an anthracene derivative represented by the following formula (1-2): wherein Ar 11 and Ar 12 each independently represent a substituted or unsubstituted aryl group having 6 to 20 ring carbon atoms, and R 1 to R 8 each independently represent a group selected from the group consisting of a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 50 ring carbon atoms, a substituted or unsubstituted arylthio group having 6 to 50 ring carbon atoms, a substituted or unsubstituted alkoxycarbonyl group having 2 to 50 carbon atoms, a substituted or unsubstituted silyl group, a carboxyl group; a halogen atom, a cyano group, a nitro group, and a hydroxyl group.