A new red light-emitting electroluminescent material of the dopant-host scheme is reported. A novel green light-emitting metal complex bis-(2-oxybenzylidene-4-tert-butylaniline)zinc(II), Zn(OBBA)(2). is used as a host material and Nile Red (NR) is used as a dopant. Evidences of the effective electronic excitation energy transfer from host to guest molecules are found. Exciton diffusion and single-step transfer are discussed as possible transfer mechanisms; the former process is considered to prevail in this system.