基于WO3电荷产生层在叠层有机电致发光器件中的工作机理研究

Interfacial electronic structures of WO3-based charge generation layers(CGL) used in tandem organic light-emitting dioedes were studied via X-ray and untraviolet photoemission spectroscopies (XPS and UPS). Important factors controlling their functional effectiveness for charge carrier generation and injection, as well as their working mechanisms were analyzed. It is demonstrated that WO3 can pronouncedly modify the energy level alignment, beneficial to charge separation at the p-n junction NPB/WO3 interface. Moreover, Mg:Alq3 is favorable to the injection of electrons from MoO3 into the electron-transporting layer of the adjacent emission units and the reduction of hole leakage current by blocking holes flowing through the CGL from the anode side into the cathode-side emission unit.