Organic thin film electroluminescent devices with a novel distyrylarylenes derivative-4,4′-bis[2,2-(1-naphthyl,phenyl)vinyl]-1,1′-biphenyl (NPVBi) as an emitting layer have been prepared. The structures of these devices are: ITO/TPD/NPVBi/Alq3/LiF/Al, in which the thickness of TPD, the sum of NPVBi and Alq3 are kept at 50 nm. By adjusting the thickness of the NPVBi and Alq 3, in the device with the thickness of 30 nm NPVBi and 20 nm Alq 3, a good blue color purity of electroluminescence, of which the highest luminance is 708 cd/m 2, and the maximum luminous efficiency is estimated to be 1.13 lm/W, respectively, is achieved. It is proved that luminous properties of the devices can be controlled by the thickness of the emitting layer NPVBi and electron transport layer Alq3.