Solution-based grown ZnO nanorods/polyfluorene light emitting diodes for white light emission

Here, we report the use of organic/inorganic heterostructure to fabricate the p-n heterojunction devices. The heterostructure provides a new approach for constructing high performance electroluminescence devices which improve the balance of hole and electron injection. In this study, we fabricated the white-light inorganic/organic heterojunction diode LEDs, using p-type polymer (PF) and n-type ZnO nanorods (NR). The PF thin films are fabricated by the spin-coating method. ZnO NR array have been produced on PF thin film by hydrothermal method. The device with ZnO NR array shows five fold enhancement of current density at the same voltage. The ZnO enhances electrons and holes to recombine in the interface between ZnO NRs and PF.