有机异质结连接层因其具有良好的透光性能、制备工艺和有机电致发光器件(Organic light-emitting diodes, OLEDs)完全兼容的优点, 被广泛应用于叠层OLEDs中。在叠层OLEDs中, 连接层可产生电荷, 其工作性能是影响叠层OLEDs性能的关键因素之一。为了获得最佳性能的有机异质结连接层, 本文制备了结构为glass/ITO/tris(8-hydroxyquinoline) aluminum(Alq3)(60 nm)/C60(x nm)/CuPc(y nm)/N,N′-bis(naphthalen-1-yl)-N,N′-bis (phenyl)-be-nzidine(NPB) (40 nm)/Al (100 nm)的有机器件, 直接获得了有机异质结连接层C60/CuPc产生的器件电流。通过结构优化发现, 结构为C60(30 nm)/CuPc(10 nm)的连接层具有最强的电荷产生能力, 并对最优结构连接层形成的物理机制作了合理的解释. 本文获得的结果可为理解有机异质结连接层工作机理以及制备高性能叠层OLEDs提供理论基础。

Organic heterojunction connector(OHC) layers were widely used in tandem organic light emitting diodes(OLEDs) for their good light transmittance and technological compatibility with OLEDs. In a tandem OLED, the OHC layers, serving as the charge generation layer, played an important role in tandem OLEDs to function efficiently. In order to obtain the OHC layers with best performance, the devices with the structure of glass/ITO/tris(8-hydroxyquinoline) aluminum (Alq3)(60 nm)/C60(x nm)/CuPc(y nm)/N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl)-be-nzidine (NPB)(40 nm)/Al(100 nm) were fabricated. The current density-voltage characteristic of the fabricated devices revealed that the OHC layer with the structure of C60/CuPc can generate charge carriers effectively, and show the largest charge carrier generation ability with the structure of C60(30 nm)/CuPc(10 nm). The forming physical mechanism of optimized OHC layer was reasonably explained. The results obtained in this paper can present an in-depth understanding of the working mechanism of tandem OLED and help ones fabricate high efficiency OLED.