Synthesis and Photoluminescence Properties of Niobate Layered Oxides Intercalated with Rare Earth Ions by Electrostatic Self-Assembly Methods

Abstract

The niobate layered oxides intercalated with Tb³⁺ or Eu³⁺ ions were prepared by the electrostatic self-assembly deposition method. The Tb³⁺ ions in the interlayer exhibited green luminescence by energy transfer from the host NbO₆ layer to the guest Tb³⁺ ions, which was based on the niobate nanosheet band gap excitation. The Tb³⁺ emission intensity decreased with decreasing interlayer water molecules, indicating that the presence of interlayer water molecules is inevitable for the Tb³⁺ emission assigned to the energy transfer. On the other hand, the emission intensity of Eu³⁺ in the interlayer was weaker than that of Tb³⁺.

Keywords:

• electrostatic self-assembly deposition
• energy transfer
• layered oxide
• nanosheet

Acknowledgments

This work was supported by a Grant-in-Aid for Scientific Research (No. 440, Panoscopic Assembling and High Ordered Functions for Rare Earth Materials, and No. 16080215) from the Ministry of Education, Culture, Sports, Science, and Technology.