The Impact of Different Alkali Metal Ions on Photoluminescence Properties of Ca₁₀M(PO₄)₇:Eu²⁺ (M: Li, Na, K)

Abstract:

A series of novel luminescent materials Ca₁₀M(PO₄)₇:Eu²⁺ (M: Li, Na, K) were synthesized by the solid-state reaction. The previous literatures indicate that the doped different alkali metal ions can only lead to regular shift of the emission and excitation spectra. Howerver, in this paper, we found the result that these three kinds of phosphors showed huge differences between the emission spectra intensity as well as the positions of the excitation and emission spectra peaks. No any regulars can be found. In order to explore it, crystal structure, the performance of photoluminescence spectra and CIE coordinates have been systematically investigated and discussed. In Ca₁₀Li (PO₄)₇, Ca₁₀Na (PO₄)₇ and Ca₁₀K(PO₄)₇ host lattices, the positions of the cations are different, leading to three different crystal structures. Besides, the coordination conditions of the luminescent centers Eu²⁺ ions are also changed by the incorporation of the alkali metal ions. Thus the enormous disparity on the luminescence intensity as well as the excitation and emission peak positions may be ascribed to these three quite different crystal fields and different coordination numbers of the luminescent central ion in the Ca₁₀M(PO₄)₇:Eu²⁺ (M: Li, Na, K) phosphors.

• Periodical: Materials Science Forum (Volume 914)
• Pages: 80-86
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.914.80
• Online since: February 2018
• Authors: Jian Wen Zhao*, Jun Dong, Jian Zhou, Xiao Qiang Wen, Shu Zhong Yang, Ling Shan Luo, Di Wu, Wen Wen Liu, Hou Qun Xiao, You Chi Zhou, Yin Yi Xiao, Fan Yang
• Keywords: Ca₁₀M(PO₄)₇:Eu²⁺ (M: Li, Na, K), Crystal Structures, Luminescence, Phosphor

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