The Inorganic-organic Hybrid Junction Based On N-ZnO Nanorods/p-polyfluorene Structure And Its Optoelectronic Characteristics

Recently, white-light emitting diode (LED) is triggering a revolution of general illumination. As a novel, convenient and low-cost approach to straightforward white-light electroluminescence, the inorganic-organic hybrid junction devices are being studied extensively around the world, which take advantage of the high carrier mobility of inorganic materials and the high luminescence efficiency of organic materials at very low cost.In particular, ZnO nanostructures have currently got more interests due to the large surface area to volume ratio, quantum size effect as well as the their self organized growth on almost any substrates regardless of the lattice mismatch between ZnO and the substrate. So far, there have been several reports on the realization of electroluminescence from ZnO based inorganic-organic heterojunction nanostructures. However, most emissions are from either ZnO only or the organic layer only. Bright white-light electroluminescence was recently achieved from ZnO nanorod (NR)/polyfluorene (PF) inorganic-organic heteroj unction light-emitting diodes (LEDs), confirming the ZnO NR/PF inorganic-organic heterojunction is very promising for developing high brightness straightforward white-light emitting diodes.In our very recent studies, controllable growth of well-aligned ZnO NRs with high optical quality was successfully achieved by low-temperature aqueous chemical growth method via adjusting the preparation parameters. Low-temperature aqueous chemical growth method has been proven to be a high performance growth technique for ZnO NRs, due to its excellent advantages such as low cost, low temperature, non-toxic operation and environmental friendliness. There are different options of the choice for the p-type polymers to be combined with n-type ZnO NRs to form the inorganic-organic hybrid junction devices. Among the possible candidates, PF are novel and promising blue light emitting materials with extremely high efficiency. In addition, the advantage of using PF polymer was the possibility of growing the ZnO NRs by low temperature approaches on large substrates and hence the potential of developing large area white light emitting sources.In this paper, we report the inorganic-organic hybrid junction synthesized on ITO glass substrate, which is consisted of an n-type ZnO nanorods (NRs) grown by low-temperature aqueous chemical growth method and a p-type Polyfluorene (PF) organic film fabricated by spin-coating.1. The ZnO NR/PF inorganic-organic hybrid junction device is designed and fabricated。 The effects of ZnO seeds layer on nanorods morphology are investigated。2. we use PL spectrum to analyze the instability of the polyfluorene.Electrical properties of the hybrid structure made of PF and ZnO nanorods (or ZnO films), effect of precursor concentration on ZnO nanorods morphology, transmissivity of nanorods (grown with different precursor concentration), PF and ITO substrate, optical properties of ZnO nanorods grown on ITO glasses substrate and PF layer are compared and analyzed. An ideal p-n hybrid junction structure is achieved eventually.