Self-Propagating Combustion Synthesis, Luminescent Properties and Photocatalytic Activities of Pure Ca12Al14O33: Tb3+(Sm3+).

Rong Liu,Changchang Ma,Yongsheng Yan

doi:10.3389/fchem.2018.00069

Rong Liu, Changchang Ma + Show 1 more

Open Access

https://doi.org/10.3389/fchem.2018.00069

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Abstract

The dual-functional Ca12Al14O33: Tb3+ and Ca12Al14O33: Sm3+ materials were prepared by the Self-Propagating Combustion Synthesis (SPCS) technology. The structure, morphology and light absorption property were investigated by XRD, FT-IR, UV-Vis DRS and SEM etc. The doping of Tb3+ and Sm3+ ions had not changed cubic structure of Ca12Al14O33 but leaded to the slight lattice dilatation and the red-shifts of absorption peaks/edges. The excitation and emission spectra indicated that Ca12Al14O33: Tb3+ and Ca12Al14O33: Sm3+ are superior green and red luminescent materials, respectively, and it displayed the distinctly refined structure characteristics which had importantly reference value for the energy level investigation of Tb3+ and Sm3+ ions. Meanwhile, Ca12Al14O33: Tb3+ and Ca12Al14O33: Sm3+ also exhibited the improved photocatalytic degradation for removing dye MB compared with bare Ca12Al14O33.

Highlights

In recent years, the widespread application of rare-earth luminescent materials (RELMs) has been proved to promote the upgrading of products in display area (Yang et al, 2001; Xie et al, 2002; Zhang et al, 2017)
The results demonstrate that crystal cells of Ca12Al14O33: Tb3+ and Ca12Al14O33: Sm3+ belong to the cubic crystal system with an I-43d space group, and the crystal cell parameters are a = 11.9895 Å and a = 11.9892 Å, Z = 2, respectively
The crystal cell parameters of two samples are slightly bigger than that of Ca12Al14O33 (11.9820 Å), which means that lattice mild expansion takes place after a small amount of Tb3+ or Sm3+ ions entering the crystal lattice to replace Ca2+ ions in Ca12Al14O33

Summary

Introduction

The widespread application of rare-earth luminescent materials (RELMs) has been proved to promote the upgrading of products in display area (Yang et al, 2001; Xie et al, 2002; Zhang et al, 2017). The stronger emission peaks located at 456, 463, and 482 nm origin from the higher excited states 5D3→ 7F3, 7F2, 7F1 energy level transitions, respectively, which indicates that there is lightly cross relaxation between 5D3 and 5D4 energy levels (Fu et al, 2010; Dong, 2011).

Results

Conclusion