High bright white organic light-emitting diode based on mixing orange and blue emission

White organic light-emitting diodes have been everyone's attention recently. Suitable combination of greenish-red and blue emission can get white light emission. The structure is ITO/NPB/DPVBi/Alq3:DCM/LiF/Al. N,N′-diphenyl- N,N′- (2-napthyl)-(1,1′-phenyl)-4,4′-diamine (NPB) is used as a hole transport layer. 4,4-Bis(2,2-diphenyl-ethen-1-yl)-biphenyl (DPVBi) and 4- (dicyanomethylene)-2- methyl-6-(4-dimethylaminost- yry)-4H-pyran doped into Tris(8-quinolinolato) aluminum (DCM:Alq3) layers are used as blue-emitting and orange-emitting layers, respectively. The optimum co-evaporated rate is 0.01:1 for DCM relative to Alq3 to get orange-light emission in coevaporation. LiF layer inserted is used as a buffer layer to increase the electron injection efficiency. The maximum luminance is 15000 cd/m2 at 20 V and 8010 cd/m2 at 12 V, whose CIE coordinates are x=0.3520x=0.3520, y=0.2956y=0.2956.