Rare Earth Complexes Doped Poly Methyl Methacrylate

In recently years, rare-earth complexes have attracted enormous attention for applications in various fields as luminescent functional materials, such as chem- and bio-sensors, electroluminescence devieces, and optical lasers. Using evaporating solvent, acetylactonate hydrate including Europium acetylacetonate hydrate, terbium acetylacetonate hydrate and neodymium acetylacetonate doped PMMA were prepared, and this series of samples were characterized by TGA, IR, including fluorescence.Europium acetylacetonate hydrate doped poly methyl methacrylate(PMMA) have two kinds of fluorescence centers of europium, due to the coordination between C=O in PMMA and europium ions. Judd-Ofelt parameters ?2 and ?4(23.73?10?20cm2 and 2.72?10?20cm2) indicate a high inversion asymmetric and strong covalent environment around Eu3+ in PMMA. Efficient purplish-red and red fluorescence was obtained from europium acetylacetonate hydrate doped PMMA under 365 nm and 254 nm excitation respectively, indicating that it can be used as UV sensitive components for fiber optic sensors. It is expected to further develop medical fiber and flexible communication fiber, which supports multi-mode transmission as core material combined with the pure PMMA used as cladding material fabricating standard 9?m/125?m optical fiber. Europium acetylacetonate hydrate doped PMMA sample decompose start from 300℃,which is higher than 281℃ of pure PMMA. These results indicate that PMMA is an effective photoluminescence cosensitizer and PMMA doped with rare earth acetylacetonate hydrates is a promising candidate for a series of optoelectronic functional devices.Terbium polymethyl methacrylate hydrate doped PMMA presented a bright green light under 254 nm UV excitation. Excitation and emission spectra show terbium complexes are more stable fixed in PMMA, the bright green light originated from 5D4?7F5 transition of Tb3+. Under 365 nm UV excitation EAH and TAH co-doped PMMA shows purple white fluorescent, Considering emission spectra, in the co-doped system europium and terbium ions can emitting light efficiently.Neodymium acetylacetonate hydrate(NAH) doped poly methyl methacrylate(PMMA) has been prepared and near-infrared(NIR) 1069 nm and 1342 nm emissions possessing the full-widths at half-maximum(FWHM) of correspondingly 61 and 75 nm have been observed. Judd-Ofelt intensity parameters ?t(t=2, 4, 6) are respectively derived to be 16.38?10?20, 11.37?10?20 and 9.51?10?20cm2, indicating a high asymmetrical and covalent environment of Nd3+ in NAH doped PMMA. The spontaneous emission probabilities for 4F3/2?4I11/2 and 4F3/2?4I13/2 transitions are severally 2533.9 and 455.5s?1, from which the associated maximum stimulated emission cross-sections have been determined to be 3.19?10?20 and 1.28?10?20cm2, respectively. High emission probabilities and large emission cross-sections of NIR fluorescence in NAH doped PMMA reveal its potentials as a NIR polymer optical material in practical applications.