Hydrothermal Synthesis of Ca_(1-3x/2)Tb_xWO₄ Microcrystallines and Their Luminescent Properties

Abstract

Ca_(1–3x/2)Tb _x WO₄ solid solution microcrystallines have been synthesized by hydrothermal method; the crystal structure, surface morphology and room temperature photoluminescence properties of the as-synthesized microcrystallines were investigated by through X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and fluorescence analysis (FA). Our results reveal that the obtained Ca_(1–3x/2)Tb _x WO₄ microcrystallines are single-phase scheelite structure with tetragonal symmetry. The doping of Tb³⁺ inhibits the grain growth, decreases the intrinsic emission of WO₄ ²⁻ complex ions and enhances the green emission of the microcrystallines. Moreover, the green emission intensity (λ = 545 nm) of the as-synthesized Ca_(1–3x/2)Tb _x WO₄ microcrystallines phosphors increases with the increasing doping level of Tb³⁺ ions, giving the maximum value at x = 0.07.

Keywords:

• Optical materials
• Chemical synthesis
• X-ray diffraction
• Luminescence

Acknowledgments

This work was supported by the Open Project of State Key Laboratory of Electronic Thin Films and Integrated Devices (UESTC, No.KFJJ201109), the Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials (10zxfk27) and Scientific Research Fund of Sichuan Provincial Education Department (No. 12ZA142, 11ZZ013 and 09ZA092).