Our aim is to iprove the charge-generation efficiency of organic-photoreceptor materials used in xerography and for laser pronters by mixing the material with buckminstrefullerne C_60. The umproventnes is based on an electron transfer from the excited excitonic state of the photoreceptor molecule to the C_60 thus reducing the recombination probability. Typical materials studied are various metal-phthalocyanines (M-Pc,with M=TiO, VO, Ni, Fe, Cu) and metal-free H_2-Pc. Using techniques like X-ray absorption near edge spectroscopy (XANES) and photoelectron spectroscopy with ultraviolet radiation (UPS) we demonstrate that the electron transfer is energetically possible and no ground state electron transfer occurs. The observation of fluorescence quenching upon with C_60 validates the electron transfer-model.
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