Correlation of X-Ray Diffraction, X-Ray Absorption Spectroscopy and Optical Properties of Europium Activated Spaniel Calcium Stannate

Abstract

Ca₂SnO₄:xEu³⁺ phosphors were synthesized by solid-state reaction method and characterized systematically using by XRD, XANES, EXAFS and PL spectroscopy. The XRD, XANES and EXAFS confirmed the formation of the Ca₂SnO₄ and the stabilization of Sn and Eu ions in 4+ and 3+ oxidation states. The PL properties of theses phosphor were investigated at room temperature. The emission spectra represent reddish-orange performance, which is due to the ⁵D₀ → ⁷F_J (J = 0, 1, 2, 3, 4) transition of Eu ions. The red emission from transition ⁵D₀ → ⁷F₂ (red) is dominate over that of ⁵D₀ → ⁷F₁ (orange). The impact of doping Eu³⁺ and PL properties were investigated, and we propose a feasible interpretation, which this phosphor could be a good candidate as a reddish-orange component in the fabrication of white LEDs.

Keywords:

• Ca₂SnO₄
• XANES
• EXAFS
• PL properties

Additional information

Funding

This work was supported by Suranaree University of Technology (SUT) and by Thailand Science Research and Innovation (TSRI) and also acknowledge the partially support by the Research Network NANOTEC (RNN) program of the National Nanotechnology Center (NANOTEC), NSTDA, Synchrotron Light Research Institute (Public Organization), Thailand.