White organic light emitting devices with a color conversion layer

摘要

A white organic light emitting device(WOLED) combining the blue organic light emitting device with a red color conversion layer(CCL) is reported,which includes a fluorescent material N-(4-((E)-2-(6-((E)-4-(diphenylamino) styryl)naphtha len-2-yl)vinyl) phenyl)-N-phenylbenzenamine(N-BDAVBi) doped into 4,4'-N,N'-dicarbazole-biphenyl(CBP) as the blue light emitting layer,and the poly(2-methoxy-5-(2'-ethylhexoxy)-1,4-phenylene vinylene(MEH-PPV) as a red CCL.By optimizing the concentration of MEH-PPV in the CCL,a good white light emission is obtained,which shows that the stable CIE coordinates of(0.33,0.34) will have a slight change when the driving voltage is increased from 6 to 11 V.The maximum brightness and current efficiency of the optimized device are 11294 cd/m2 and 6.4 cd/A,respectively.