Synthesis And Spectrum Property Studies Of Imidazole-porphyrin

Red, green and blue are called primary colors in the active LED products such as display etc. We can get the majority of most other colors from change the ratio of red, green and blue, but we can't get these three primary colors from other colors. Therefore, the luminescent materials of three primary colors is extremely important in the study of organic light-emitting materials. Now, the red light-emitting materials, as one of the three primary colors, has not been resolved very well, to some extent, hindered the realization of full-color display.Porphyrins are good red light-emitting materials, but simply using porphyrins as red light-emitting materials are not very high in fluorescence quantum yield. Through the modification of porphyrin, we can introduce appropriate conjugate groups to porphyrin as the energy donor. In a certain wavelength of light excitation, energy transfer can occur and transfer to the porphyrin to improve the luminescence properties of porphyrin. Imidazole compounds have conjugate structure and high fluorescence quantum yield. The fluorescence emission spectra of imidazole compounds have a considerable degree of overlap with the UV absorption spectrum of porphyrins. It will be able to improve the luminescent properties of porphyrins, if the transfer energy can occur between the imidazole compounds and porphyrins.In this paper, we start at the characteristics that the fluorescence emission spectra of imidazole compounds have a considerable degree of overlap with the UV absorption spectrum of porphyrins. We use flexible chain connected the porphyrin with imidazole by chemical reaction. It is found that the fluorescence quantum yield (0.16-0.20) has been greatly improved compared with tetraphenyl porphine (0.11), and the fluorescence quantum yield also change with the different lengths of flexible chain which between the porphyrin and imidazole.The main contents of this thesis are as follows:(1) Synthesis 5-hydroxylphenyl 10, 15, 20-triphenyl porphine by Alder's method and imidazole by Debus's method. The synthetic compounds were charactered by MS and 1HNMR, and improved the synthetic methods.(2) Design and synthesis five imidazole-porphyrins with different lengths of flexible chain by nucleophilic substitution reactions and click chemistry. These imidazole-porphyrins were charactered by MS and 1HNMR, and explored the synthetic methods.(3) The fluorescence quantum yield and energy transfer efficiency were computed by UV spectra and fluorescence spectra of porphyrins. We found that the fluorescence quantum yield is closely related to the structure of imidazole-porphyrins. The relationship of molecular structure and the spectrum properties were scientifically discussed.