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Inorganic matrix organic rare earth complexes in situ synthesis process and Spectroscopic Properties of

Author: LiShaoBin
Tutor: FanXianPing
School: Zhejiang University
Course: Materials Science
Keywords: Inorganic matrix Situ synthesis Spectroscopic Properties In rare earth Complexes Fluorescence lifetime Chemical synthesis PHBA Scattering spectra Gel
CLC: O641.4
Type: Master's thesis
Year: 2002
Downloads: 93
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Abstract

This paper summarized the sol - gel process development, on the basis of the spectral theory of rare earth organic complexes, the application of UV - visible absorption spectroscopy, infrared spectroscopy, fluorescence spectroscopy, fluorescence lifetime spectroscopy, Raman scattering spectroscopy, advanced testing methods, System rare earth organic complexes in situ gel formation process as well as rare earth doped organic complexes gel spectroscopic properties of the doping concentration and heat treatment temperature on the spectroscopic properties of the law. Situ synthesis gel synthesis PA: Eu3 'of PHBA: Tb3', dBm: Eu3 ', ACAC: Eu3' TFA: Eu to 'and HFA: Eu3' complexes. By IR, Raman scattering spectra and fluorescence spectra confirm the formation of rare earth organic complexes in the gel. The study found that the gel in dBm: Eu3 ', ACAC: Eu3' TFA: Eu3 'and HFA: Eu3' after the formation of complexes due to the effective UV absorption of the organic ligand and its effective energy passing between the rare earth ions, these organic complexes of the rare-earth doped gel fluorescence intensity and fluorescence lifetime is greater than the single doped rare earth ion gel. In situ synthesis gel PA: Eu3 'and PHBA: Tb3' complexes with chemically synthesized PA: Eu3 'and PHBA: Tb3' complexes expressed in wide peaks in the excitation spectrum, with a single rare earth ion doped gel narrow peak is very different, that have been synthesized by chemical synthesis and in situ synthesis of the PA: Eu ~ 3 and PHBA: the Tb3 'with matter, by Raman spectroscopy for chemical synthesis PA: Eu3' the complexes with EuCl, and PA co-doped gel and chemical synthesis PHBA: Tb3 'complex and TbCl: PHBA co-doped gel comparative analysis also confirmed the the PA: Eu3' and PHBA: Tb3 'original gel digital compositing. Studies show that the doped gel in PA: Eu3 concentration of its fluorescence intensity and fluorescence lifetime have the same impact law when EuCl: and 3% PA Codoped the maximum luminous intensity, fluorescence lifetime long due to the ease of formation of the rare earth organic complexes in the gel is not the same, leading to the gel heat treatment effect is not the same. DBM: Eu3, ACAC: Eu3 'and TFA: Eu3' as long as a little temperature can be formed, the PHBA: Tb2, HFA: Eu3 'complexes are formed gradually with the increase of the gel heat treatment temperature, the latter was The synthesis is more difficult than the former. This paper also studied the chemical synthesis of rare earth organic complexes and rare earth organic complexes doped gel emission time decay curve, the decay curve in line with a single exponential curve, and some in line with the double exponential curve. Double Zhejiang University Journal exponential curve may appear in the gel complexes in different micro-environments affected by decay rate differences between the resulting fast and slow decay component. Chemical synthesis of rare earth organic complexes in situ synthesis of the fluorescence lifetime of rare earth organic complexes comparative study found that the fluorescence lifetime of the gel in situ synthesis of complexes, inorganic matrix doped in which complexes play a protective effect of making the complexes in a relatively isolated, stable chemical environment, thereby increasing the fluorescence lifetime of the complexes. When the organic ligands form complexes with rare earth ions, due to the differences in the molecular structure of the ligand lead to rare earth ions the symmetrical configuration change, the more off-center configuration makes it more a greater degree of lifting the EU ', \bamboo even transition Abstain role, thus reducing the consumption of non-radiative transitions, to improve the fluorescence intensity of the complexes the lower symmetry TFA and ELI 'is the fluorescence intensity of the complexes formed is strong.

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