[Photo-induced electron transfer effects of poly(2-methoxy-5-octyloxy)-p-phenylene vinylene/Y2O3:Eu3+ nano-composites].

The photoelectric nano-composites of poly(2-methoxy-5-octyloxy)-p-phenylene vinylene/Y_2O_3:Eu~(3+)(PMOCOPV/ Y_2O_3:Eu~(3+))were prepared by dehydrochlorination in-situ polymerization.The result of Fourier transform infrared spectroscopy indicates that PMOCOPV is coated on the surface of Y_2O_3:Eu~(3+).Compared with PMOCOPV,the absorption of PMOCOPV /Y_2O_3:Eu~(3+)is strengthened,and a red shift of the absorption peak can be clearly observed in the UV-Vis spectrum. Photoluminescence spectroscopy indicates that the maximum emission wavelength of the PMOCOPV/Y_2O_3:Eu~(3+)is red-shifted and the intensity of photoluminescence increases in comparison with PMOCOPV.PMOCOPV/Y_2O_3:Eu~(3+)shows fluorescence increasing,which involved the inter-molecular photo-induced charge transfer process.The optical band gap of PMOCOPV/Y_2O_3 :Eu~(3+)decreases.The third-order optical nonlinear susceptibility of PMOCOPV/Y_2O_3:Eu~(3+)nano-composites was measured by degenerate four wave mixing.The results show that the third-order nonlinear optical responses of PMOCOPV/Y_2O_3:Eu~(3+) nano-composites are enhanced in comparison with PMOCOPV,which can be attributed to inter-molecular photo-induced electron transfer and delocalizedπelectron coupling between PMOCOPV and Y_2O_3:Eu~(3+).