A good white emission is realized by combining blue organic light emitting devices with 4-sdicyanomethylened-2-t-butyl-6-s1,1,7,7-tetramethy ljulolidyl-9-enyl(DCJTB) which is used as color conversion layers(CCLs).We have found that the effect of fabricating CCL by vacuum depositing or spin coating technology on the device performance is very little.When the CCL,in which the concentration of DCJTB is 20 mg/ml,is prepared by spin coating,the turn-on voltage of the device is 3.4 V,the maximum luminance is 1 939 cd/m2(12 V),and the maximum current efficiency is 1.34 cd/A at 3.23 mA/cm2.Its CIE coordinates only will change from(0.36,0.33) to(0.33,0.31) when the driving voltage is increased from 5 V to 9 V,which exhibits a pure white light and good color stability.