| Rare-earth doped inorganic glasses and crystals have been studied in detail because of their wide application in a variety of advanced materials. However, most of the matrixes used so far have been inorganic glasses and crystals. In recent years, rare-earth-doped polymer systems are of interest for their potential applications for laser systems, polymer optical fiber amplifier and integrated waveguides. The Judd-ofelt theory can provide insight into the radiative properties and the nature of chemical bonding present in rare-earth chelates. In this thesis, the related research works have been carried out as follows:1. Energy Level analysisUsing the Taylor series expansion method, the energy Levels of Nd and Er chelates were analyzed.To our best knowledge, this is the first approach using the free-ion Hamiltonian model to analyze the energy levels and calculate the reduced matrix elements of Pr(DBM)3(TPPO)2 in PMMA.Using the free-ion Hamiltonian model to analyze the energy levels and calculate the reduced matrix elements of Sm(TTA)3(TPPO)2 in PMMA.2. Microstructure of RE ionsUsing the absorption spectrum and Judd-Ofelt theory, the relationship between the structure of rare-earth chelates and the nephelauxetic effect, Judd-Ofelt parameter Ω2 was analyzed.Eu(DBM)3(TPPO)-2-doped PMMA with different doping concentration were prepared and their microstructure and optical properties have been investigated by metastable state lifetime and fluorescence spectra.3. Radiative properties of rare-earth chelates doped PMMAThe influence of ligands on luminescence of rare-earth chelates doped PMMA has been investigated.
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