Distinct composite structure and properties of Eu(phen)2Cl 3(H2O)2 in poly(methyl methacrylate) and polyvinylpyrrolidone

作者：Liu Hong Guo; Lee Yong Ill^*; Qin Wei Ping; Jang Kiwan; Kim Sangsu; Feng Xu Sheng

来源：Journal of Applied Polymer Science, 2004, 92(6): 3524-3530.

DOI：10.1002/app.20375

• Amorphous structures
• Composite surfaces
• Molar ratio
• Transitions

The luminescent europium complex Eu(phen)2 Cl3(H 2O)2 (phen refers to 1,10-phenanthroline) was doped in poly(methyl methacrylate) (PMMA) and polyvinylpyrrolidone (PVP), respectively. The formed composite systems with different molar ratios of C=O groups in polymers and Eu ions were characterized by X-ray diffractometry (XRD), FTIR, and photoluminescent (PL) spectroscopy and lifetime measurement. The XRD diffractograms show that the composites of PMMA/Eu(phen)2Cl 3(H2O)2 and PVP/Eu (phen)2Cl 3(H2O)2 have crystalline and amorphous structures, respectively, arising from different interactions between the polymers and the complex, as revealed by FTIR spectra. This leads to distinct luminescent characteristics arising from the 5D o&rarr7FJ transitions of Eu(III) ion (J = 0-4). For the composite systems of PMMA/complex, the characteristics of the emission lines change with decreasing molar ratios of C=O/Eu and approach that of the pure complex; whereas the composite systems of PVP/complex have similar spectral features, regardless of the molar ratios, differing from that of the pure complex. The polymer matrices have a substantial influence on the structure and properties of the composites. ? 2004 Wiley Periodicals, Inc.

• 出版日期2004