PS:NPB复合空穴传输层的有机电致发光特性

Organic Electroluminescent Characteristics of Compound PS∶NPB Hole Transporting Layer

制备了结构为indium-tin-oxide(ITO)/polystyrene(PS)∶N,N’-bis-(3-Naphthyl)-N,N’-biphenyl-(1,1’-biphenyl)-4,4’-diamine(NPB)/tris-(8-hydroxyquinoline)-aluminum(Alq3)/Mg∶Ag的绿光双层有机电致发光器件(OLED).空穴传输层采用复合结构,为有机小分子空穴传输材料NPB与聚合物母体材料聚苯乙烯(PS)的掺杂体系,并利用旋涂工艺简化了薄膜制备.通过调节该体系的组分,制备出具有不同PS∶NPB浓度比的OLED器件,并对器件的电致发光特性进行了表征.研究发现,不同的NPB掺杂浓度对复合空穴传输层以及器件的光电特性具有显著影响.当PS和NPB的组分浓度比为1时,可以最大限度地优化该器件的性能.该项研究有助于OLED器件复合功能层的构建以及工艺方法的改进.

Green organic light-emitting devices with the structure of indium-tin-oxide （ITO）/polystyrene（PS） ： N,N＇-bis-（3-naphthyl）- N, N＇- biphenyl- （ 1,1 ＇-biphenyl） -4,4 ＇-diamine （NPB） /tris- （8-hydroxyquinoline） -aluminum （Alq3） /Mg ： Ag were fabricated. A doping system consisting of small-molecular hole transporting material NPB and polymeric matrix polystyrene （PS） was employed as the compound hole transporting layer （HTL）, and the thin film preparation was simplified via the spin-coating technique. By adjusting the component ratio of the system, we constructed several devices with different concentration proportions of PS ： NPB. The electroluminescent characteristics of the devices were investigated and discussed. The results demonstrate that the doping concentration of NPB has a remarkable impact on the optoelectric performance of both the HTL and the device. Optimum device performance could be obtained by choosing the best concentration proportion of PS ： NPB to be 1 ： 1. This contributes to the construction of compound functional layers of OLED devices and to the technical improvement.