A significant increase in the quantum efficiency of an organic red-light-emitting diode was achieved through coupling with localized surface plasmons of Au nanorods with a length of 50–60 nm embedded on the substrate anode. We used 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM)-doped tris(8-hydroxylquinolianato)aluminum(III) (Alq3) as an emission layer. The fabricated diode structure consists of an indium tin oxide (ITO) anode, a Cu phthalocyanine (CuPc) hole transport layer, an Alq3 electron transport layer, a LiF electron injection layer, and an Al cathode. We observed a 3-fold increase in the intensity of molecular fluorescence compared with that of a conventional diode structure.