Journal of Sol-Gel Science and Technology

, Volume 81, Issue 2, pp 413–422 | Cite as

Study on structure and fluorescence of Tb-doped CaAl LDHs prepared in ethanol/water system

  • Yufeng Chen
  • Xiaoqing Wang
  • Yao Bao
  • Weinan Wu
Original Paper: Fundamentals of sol-gel and hybrid materials processing


An important material applied in biological fluorescent detector and medical treatment is highly desired in view of the biocompatibility and fluorescent property. Here, Tb-doped CaAl-layered double hydroxides with Ca2+/(Al3+ + Tb3+) molar ratio of 1.0, 2.0, 3.0, and 4.0 have been successfully prepared in a mixed solution of ethanol and water in a reasonable proportion. Chemical compositional analyses revealed that the experimental value of Ca2+/(Al3+ + Tb3+) molar ratio present in the samples was close to the initial value of Ca2+/(Al3+ + Tb3+) molar ratio of raw reactants. In the X-ray diffraction results, it was found that the typical layered double hydroxides structure can be kept between the Ca2+/(Al3++Tb3+) molar ratio of 1.0 and 4.0. The structural type of the Tb-doped CaAl-layered double hydroxides was monoclinic form when the Tb content was less than of 3.0 %, while rhombohedral form appeared and retained as the content of Tb3+ is kept between 3.0 and 5.28 wt%. Photoluminescence shows strong green emissions attributed to 5D4-7FJ (J = 3, 4, 5, 6) transition of Tb3+ ions incorporated in the Tb-doped CaAl-layered double hydroxides.

Graphical Abstract

A series of Tb-doped CaAl-LDHs with different molar ratio of Ca2+/(Al3+ + Tb3+) have been synthesized by co-precipitation in a mixed ethanol/water system. Strong green emission appeared in the Tb-doped CaAl-LDH. The Tb–CaAl-LDHs may be a promising biological fluorescent material because of the biocompatibility of Ca2+ ions as well as the fluorescent property of Tb3+ ions. Open image in new window


CaAl-LDH Tb dopant Fluorescence 



The Project was supported by the National Natural Science Foundation of China (Grant No.51162021).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.


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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Yufeng Chen
    • 1
  • Xiaoqing Wang
    • 1
  • Yao Bao
    • 1
  • Weinan Wu
    • 1
  1. 1.College of ChemistryNanchang UniversityNanchangChina

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