An insert layer structure organic electroluminescent device(OLED) based on a new luminescent material(Zn(salen) ) is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn(salen) /Liq/LiF/Al/CuPc/NPD/Zn(salen) /Liq/LiF/Al. Effective insert electrode layers comprising LiF(1nm) /Al(5 nm) are used as a single semitransparent mirror,and bilayer cathode LiF(1 nm) /Al(100 nm) is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m2 and 2.652 cd/A,respectively,which are 2.1 and 3.7 times higher than the conventional device,respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.