Characterization Of Clusters In Rare Earth-Doped Polymer Optical Fiber

The characterization of clusters in rare earth-doped polymer optical fiber (POF) was studied in this thesis.The clustering in Eu(DBM)₃Phen-PMMA doped polymer optical fiber developed by our laboratory was studied thoroughly. The cross relaxation process of clustering Eu³⁺ ions was build, the effect of percentage of clusters p, the time of cross relaxation τ and concentration of Eu³⁺ to fiber transmission were analyzed theoretically by rate equation. The percentages of clustering ions in different POFs were obtained combining with fiber transmission experiment, the clustering in POFs with different concentrations were analyzed theoretically.The clustering in Sm(DBM)₃Phen-PMMA doped polymer optical fiber was studied. The cross relaxation process of clustering Sm³⁺ ions was build, the relationship between concentration and fiber transmission was analyzed theoretically by rate equation, the effect of percentage of clusters ρ and the time of cross relaxation τ to fiber transmission with clustering in POF were studied. The percentages of clustering ions in different POFs were obtained combining with fiber transmission experiment, the clustering in POFs with different concentrations were analyzed theoretically.The transmissions of rare earth-doped polymers which uniformly doped (without clusters) and clustering were studied. The dielectric components in this kind of rare earth doped polymer were studied by effective medium approximately (EMA) combing with fractal model, and the transmissions of this kind of materials were studied in different conditions. At last, the clustering in Eu(OA)₃ and Eu(DBM)₃Phen were studied by scanning near-field optical microscope (SNOM), and the reason of clustering was analyzed from molecule Structure.