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Eu ~ (3) the fluorescent copolymer and polymer matrix composites Preparation and Properties of

Author: XuChuanJie
Tutor: ZhangMing；YanChangHao
School: Yangzhou University
Course: Materials Science
Keywords: Copolymer Complexes composed of Eu Rare Earth Polymer Rare earth complexes Co-luminescence Effect Rare earth ions Fluorescent properties Fluorescence analysis Ligand Rare Earth Organic Complex Emitting complexes Sensitizing effect Fluorescence enhancement effect Bidentate Ternary complexes Europium Complex Transition spectra Triplet level Luminescent properties
CLC: O631.3
Type: Master's thesis
Year: 2010
Downloads: 225
Quote: 1
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Abstract


Rare Earth Organic light-emitting materials because of the unique structure and properties of the rare-earth ion, the fluorescence emitted both rare earth ion luminescence intensity, pure color and organic compounds required low excitation energy, high efficiency fluorescent, soluble in organic solvents, etc., in order to people to explore new light-emitting energy, light-emitting material provides a new idea. This research work to the synthesis of a new rare earth polymer light-emitting materials, synthetic polymerization activity of rare earth complexes copolymerization, as well as a study on the impact of light-emitting polymer materials on the performance of the light-emitting copolymer the luminous performance factors, and the Co-luminescence Effect of rare earth ions in the polymer matrix. Thesis commence from the following aspects: First, have the polymerization active luminescent complexes Synthesis and Properties of europium oxide as raw material, α-methacrylate ligand, 1,10 - phenanthroline second ligand, with water as the solvent, the co-precipitation method to prepare europium luminescence complexes Eu (MAA) 3phen, for the synthesis of bonded rare earth polymer materials provide the raw material, its composition, structure and properties were characterized. The results show that complexes of bidentate structure; Elemental analysis shows the chemical composition of the complexes Eu (MAA) 3phen; XRD analysis showed that the complexes have a good crystallinity, the single crystal analysis result further identified complexes result is bidentate structure; Ultraviolet absorption spectrum showed that the second ligand phen has a strong absorption in the ultraviolet region, and complexes mainly for energy absorption in the ultraviolet region of phen ligand π-π * transition absorption; STA test results show that complexes have good thermal stability, a slight decrease in 1,10 - phenanthroline introduction of the thermal stability of the complexes; complexes under UV excitation Eu3 characteristics emitted red fluorescence and complexes With increasing the concentration of rare earth ions and the temperature increases, the intensity there are varying degrees of fluorescence quenching phenomenon. Second, the study of rare earth polymer materials of complex applications in the synthesis of rare earth polymer fluorescent material has both a unique optical, electrical, and magnetic properties of rare earth ions and polymer material quality light, shock resistance and easy processing molding and excellent performance, is the most potential value functional materials. This selection of homemade complexes having high fluorescence properties and polymerization activity containing europium (Eu (MAA) 3phen), styrene (St), methyl methacrylate (MMA) as a monomer copolymerizable by free basic body prepared by pouring molding transparent optical polymer copolymer has a light-emitting materials, their relevant physical and chemical properties have been studied, investigated complexes added impact on the performance of the polymer substrate, and discussed on luminescent properties of light-emitting copolymers factors. The results showed that the rare earth complexes Eu (MAA) 3phen composite polymer able to emit strong characteristic fluorescence of rare earth ions, and the toughness of the copolymer is improved to some extent. All the rare earth-containing complexes fluorescent polymer material having a good transparency, and its visible light transmittance between 90-95%, PS on the ultraviolet region of the organic ligand complexes energy absorption no effect, can be used as with the mating material Eu (MAA) 3phen composite matrix material. Within the scope of the study, the fluorescence emission intensity of the optical material is doped with the complexes concentration increased with the increase did not occur the phenomenon of fluorescence quenching. Three dissimilar rare earth ion fluorescence enhancement effect and luminescence of rare earth ions co-luminescence effect of rare earth luminescent ions not only can absorb energy from the ligand to the luminous efficiency, but also between different rare earth ion energy transfer, energy transfer makes fluorescence enhancement. And rare earth organic polymer, the coexistence of different rare earth doped materials and rare earth ions impact study on the fluorescence properties of the material is still very rare. This paper with light rare earth ions Gd 3 , Pr 3 , the Nd 3 and poor luminescent properties of rare earth ions Dy 3 , Sm 3 system MAA phen ternary complexes, then the system complex and europium-containing complexes of rare earth codoped polystyrene matrix prepared by the co-doped rare earth luminescent polymer. Discussed the rare earth ion doped polymer containing europium fluorescence properties. Fluorescence test results show that the dissimilar rare earth ion luminescence center Eu 3 radius close to play an enhanced role in its luminous intensity, which the Gd 3 the Sm 3 the of Eu 3 , and Gd 3 the sensitizing effect of Eu 3 Sm 3 ; Dy 3 , Pr 3 , Nd 3 in the copolymer Eu 3 play a quenching effect. The paper also studied the effects of central ion doped with luminescent rare earth co-luminescence, the choice of emission fluorescence of Tb 3 and Eu 3 center ion complexes by different methods of doping complexes Eu (MAA) 3phen, complexes Tb (MAA) 3phen and PS codoped prepared doped rare earth polymer fluorescent material. Under the influencing factors on the fluorescence properties of the polymer, and the different methods of doping Tb 3 with the of Eu 3 polymer interaction. Fluorescence test results show that the mass fraction of the polymer complex affects the sensitized extent of the fluorescent material, and the bonding of the luminescent material obtained in the degree of sensitized. The results of this study showed that the bond-type rare-earth of the various embodiments of the classic radical polymerization method synthesized polymer materials, not only has the characteristics of the base material, the same time as the introduction of the rare earth ions, the material is given a new function, has a good application prospects.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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