Study Of The Synthesis Of ZnO Nanocrystal\Porphrin Composite Materials And The Energy & Electron Transfer Processes

Meso-(p-Hydroxyphenyl) porphyrins(PP) is a serie of very important organic complexwith big ring,which are used as photosensitizers, catalysts, and drugs for photo-dynamictherapy of cancer. Thus their photochemical and photophysical properties attract muchattention in recent years. Porphrin was applied in molecule electric wire, information storeand photoelectric material, due to its special property as organic large circle conjugatemolecules. Many researches were explored by utilizing its quantum efficiency of strongfluorescence. It is still an important research to prepare its compound and nanomaterials aswell as the research on the relation between fluorescence property and structure.Zinc oxide (ZnO) is an interesting â…¡-â…¥ wide band gap (3.3eV) semiconductor materialwith wurtzite structure because of many properties, such as piezoelectricity andphotoelectricity. Due to the large exciton binding energy of 60meV, which ensures the highefficient excitonic emission at room temperature, it is regarded as one of the most promisingmaterials for the ultraviolet (UV) and blue light emitting devices.We have investigated energy transfer processes between the surface state of ZnO and thefirst excited three-state of PP. On the other hand, there is electron transfer process in thesystem of PP , the electron of the first orbital transit to the second orbital. The processes ofenergy and electron transfer induce the changes of the photo luminescence spectra. In addition,we build up energy levels of ZnO nanocrystal and PP.