A fluorescent labeling agent contains a fluorescent dye represented by general formula (1). General formula (1): Q-Z—R.sub.1-R.sub.2-R.sub.3 (In the formula, Q represents the residue of a fluorescent dye. Z represents a direct bond, alkylene group, or arylene group. R.sub.1 represents a direct bond, —O—, —OP(═O)R.sub.4—, —OC(═O)—, —OS(═O).sub.2—, —OSiR.sub.5R.sub.6—, —C(═O)—, or —C(═O)NH—. R.sub.2 represents a group selected from the group consisting of alkylene groups, arylene groups, and heterocyclic groups, or represents a group provided by combining these groups. R.sub.3 represents —COOM.sub.1, —NR.sub.7R.sub.8, or —N.sup.+R.sub.9R.sub.10R.sub.11. Here, R.sub.4 represents a hydrogen atom, hydroxyl group, alkyl group, aryl group, alkoxy group, aryloxy group, or heterocyclic group. R.sub.5 and R.sub.6 each independently represent an alkyl group, aryl group, or heterocyclic group. R.sub.7-R.sub.11 each independently represent a hydrogen atom, alkyl group, or aryl group. M.sub.1 represents a monovalent cation.)

A phthalocyanine-based complex compound is represented by general formula (1) shown below,

##STR00001##

where M in general formula (1) is any of Cu, Fe, Ti, V, Ni, Pd, Pt, Pb, Si, Bi, Cd, La, Tb, Ce, Be, Mg, Co, Ru, Mn, Cr, Mo, Sn, and Zn, and may be present or absent.

An organic light-emitting device including: a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer, wherein the organic layer includes a first compound represented by Formula 1 and a second compound represented by Formula 2:

##STR00001##

When the first compound represented by Formula 1 is included in the emission layer and the second compound represented by Formula 2 is included in the first layer, an organic light-emitting device according to an embodiment of the present disclosure may have high efficiency and a long lifespan.