以DPVBi为发光层, NPB为空穴传输层, 在阳极ITO和NPB之间分别插入不同的空穴注入层CuPc和PEDOT∶PSS, 制备了两种结构的蓝色有机电致发光器件(OLEDs)： ITO/CuPc/NPB/DPVBi/BCP/Alq3/Al和ITO/PEDOT∶PSS/NPB/DPVBi/BCP/Alq3/Al, 研究了不同空穴注入材料对蓝色OLEDs发光性能的影响, 并与没有空穴注入层的器件进行了比较。 其中CuPc分别采用旋涂和真空蒸镀两种工艺, 比较了不同成膜工艺对器件发光特性的影响。 结果表明： 加入空穴注入层的器件比没有空穴注入层器件性能要好, 其中插入水溶性CuPc的器件, 其发光亮度和效率虽然比蒸镀CuPc器件要低, 但比插入PEDOT∶PSS器件发光性能要好。 又由于水溶性CuPc采用旋涂工艺成膜, 与传统CuPc相比, 制备工艺简单, 所以为一种不错的空穴注入材料。

The present work investigates the effects of different buffer layers on the performance of blue organic light-emitting diodes (OLEDs), and compares them with the device with no buffer layer.Two kinds of blue OLEDs with 4,4’-bis(2,2’-diphenyl vinyl)-1,1’-biphenyl (DPVBi) as the emitting layer, N,N’-bis-(1-naphthyl)-N,N’-1-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) as the hole transporting layer, and copper phthalocyanine (CuPc) and poly(3,4-ethylenedioxythiophene)∶poly(styrenesulphonate) PEDOT∶PSS as the hole injection layer respectively were fabricated with the structures of ITO/CuPc/NPB/DPVBi/BCP/Alq3/Al and ITO/PEDOT∶PSS/NPB/DPVBi/BCP/Alq3/Al.Moreover, the effects of different preparation technology of CuPc on the performance of OLEDs were also investigated.It was found that the performance of the devices with a hole injection layer is better than that of the device without any hole-injection layer.Although the luminance and efficiency of the water-soluble CuPc based device are worse than that of the device with thermally evaporated CuPc, but better than that of the device with water-soluble PEDOT∶PSS.So the water-soluble CuPc is a good hole injection material because it is easier to fabricate the film than traditional CuPc.