Electrospinning Preparation and Photoluminescence Properties of Rare-Earth Complex/Polymer Composite Fibers
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- 作者：Hui Zhang ; Hongwei Song ; Hongquan Yu ; Xue Bai ; Suwen Li ; Guohui Pan ; Qilin Dai ; Tie Wang ; Wenlian Li ; Shaozhe Lu ; Xinguang Ren ; Haifeng Zhao
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：May 3, 2007
- 年：2007
- 卷：111
- 期：17
- 页码：6524 - 6527
- 全文大小：294K
- 年卷期：v.111,no.17(May 3, 2007)
- ISSN：1932-7455
文摘
Composite fibers of poly(vinyl pyrrolidone) (PVP, Mw 
1 300 000) and europium complex Eu(BA)3(TPPO)2(BA =1-benzoylacetone; TPPO = triphenylphosphine oxide) with strong photoluminescence were preparedby electrospinning. Their luminescent properties were studied in comparison to that of the pure complex. Theresults indicate that due to decreased symmetry in the composites the excitation bands are split into twodifferent components, peaking at ~246 and ~336 nm, respectively, while the ratio of the electronic dipole5D0-7F2 transitions to the magnetic dipole 5D0-7F1 ones in the emission spectra becomes a little larger. Theroom temperature fluorescence lifetime for the 5D0 level becomes shorter due to increased radiative andnonradiative transition rates. The temperature dependence of photoluminescence was investigated under325-nm excitation. It is interesting to observe that in the composite fiber the total emission intensity of theEu3+ ions changes little below 150 K, while in the pure complex the intensity decreases monotonically withincreasing temperature. In addition, the composite fibers exhibit better photostability exposed to ultravioletlights. These novel luminescent composite fibers have potential application in nanodevices.
1 300 000) and europium complex Eu(BA)3(TPPO)2(BA =1-benzoylacetone; TPPO = triphenylphosphine oxide) with strong photoluminescence were preparedby electrospinning. Their luminescent properties were studied in comparison to that of the pure complex. Theresults indicate that due to decreased symmetry in the composites the excitation bands are split into twodifferent components, peaking at ~246 and ~336 nm, respectively, while the ratio of the electronic dipole5D0-7F2 transitions to the magnetic dipole 5D0-7F1 ones in the emission spectra becomes a little larger. Theroom temperature fluorescence lifetime for the 5D0 level becomes shorter due to increased radiative andnonradiative transition rates. The temperature dependence of photoluminescence was investigated under325-nm excitation. It is interesting to observe that in the composite fiber the total emission intensity of theEu3+ ions changes little below 150 K, while in the pure complex the intensity decreases monotonically withincreasing temperature. In addition, the composite fibers exhibit better photostability exposed to ultravioletlights. These novel luminescent composite fibers have potential application in nanodevices.© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |