A novel 1,5-naphthylenediamine derivative, 1,5-bis[N-(1-naphthyl)-N-phenyl]naphthalene diamine (NND), was designed and synthesized. This amine exhibited high glass transition temperature (T g =127 o C) and hole transporting ability. The device with a structure of ITO/N,N'-bis(naphthalene-1-yl)-N,N'-diphenyl-benzidine(NPB)/NND/2-(4-tert-bu tylphenyl)-5-(4-biphenyl)-1,3,4-oxadiazole (PBD)/Mg:Ag was fabricated and bright blue light emission was obtained with a peak wavelength of 432nm, and the color coordinate in CIE chromaticity is (0.172, 0.126). The brightness of 250cd/m 2 at 14V was achieved.