Lai Zhibin, Ye Jun, Xiong Jian
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China.
Carbohydr Polym. 2021 Nov 1;271:118386. doi: 10.1016/j.carbpol.2021.118386. Epub 2021 Jun 29.
A series of fluorescent nanocomplexes of carboxymethyl cellulose (CMC)/Terbium (Tb)- Europium (Eu) were successfully synthesized without introducing a second ligand. By adjusting the concentration of the coordinated ions, these nanocomplexes exhibit favorably visibly tunable luminescence properties with colors being able to change from green to red. The XPS analysis demonstrates the formation Tb(III)-O and Eu(III)-O between OH and COO in CMC and Tb or Eu ions, which is advantage for light absorption by UV-Vis spectroscopy and fluorescence spectroscopy. The ligand CMC plays a role in coordinating with terbium and europium ions, but also serves as an energy donor to these metal ions by antenna effect. Moreover, the energy transfer also occurred from terbium ions to europium ions in CMC matrix, which is responsible for the tunable luminescence properties of these complexes.
在不引入第二配体的情况下，成功合成了一系列羧甲基纤维素（CMC）/铽（Tb）-铕（Eu）荧光纳米复合物。通过调节配位离子的浓度，这些纳米复合物展现出良好的可见发光可调谐特性，颜色能够从绿色变为红色。X射线光电子能谱（XPS）分析表明，CMC中的OH和COO与Tb或Eu离子之间形成了Tb(III)-O和Eu(III)-O，这有利于通过紫外可见光谱和荧光光谱进行光吸收。配体CMC不仅在与铽和铕离子配位中发挥作用，还通过天线效应作为这些金属离子的能量供体。此外，在CMC基质中也发生了从铽离子到铕离子的能量转移，这导致了这些复合物的发光可调谐特性。
