Luminescence properties of nitrogen-rich Ca-SiAlON:Eu<sup>2+</sup> phosphors prepared by freeze-drying assisted combustion synthesis

Zhang-lin Chen; Kai Liu; Xuan-yi Yuan; Ke-xin Chen

doi:10.1007/s12613-019-1934-2

Volume 27 Issue 5

May 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(5): 687-692

Zhang-lin Chen, Kai Liu, Xuan-yi Yuan, and Ke-xin Chen, Luminescence properties of nitrogen-rich Ca-SiAlON:Eu²⁺ phosphors prepared by freeze-drying assisted combustion synthesis, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp. 687-692. https://doi.org/10.1007/s12613-019-1934-2

Cite this article as:

Zhang-lin Chen, Kai Liu, Xuan-yi Yuan, and Ke-xin Chen, Luminescence properties of nitrogen-rich Ca-SiAlON:Eu2+ phosphors prepared by freeze-drying assisted combustion synthesis, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp. 687-692. https://doi.org/10.1007/s12613-019-1934-2

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Research Article

Luminescence properties of nitrogen-rich Ca-SiAlON:Eu²⁺ phosphors prepared by freeze-drying assisted combustion synthesis

+ Author Affiliations

Corresponding authors:
Xuan-yi Yuan E-mail: yuanxuanyi@ruc.edu.cn

Ke-xin Chen E-mail: kxchen@mail.tsinghua.edu.cn
Received: 27 August 2019; Revised: 12 October 2019; Accepted: 16 October 2019; Available online: 6 November 2019

Abstract

Abstract

Nitrogen-rich Eu²⁺-doped Ca-α-SiAlON phosphors (Ca_m_/2−xSi_12−m−nAl_m_+nO_nN_16−n:xEu) were synthesized by a freeze-drying assisted combustion synthesis (CS) route. Fast-synthesized products with high purity and uniform particle morphology were confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The analysis of lattice parameters by comparison with empirical equations showed that the as-prepared phosphors had low oxygen content. A series of samples were prepared according to the stoichiometry of Ca_m_/2−0.08Si_12−mAl_mN₁₆:0.08Eu for further research. The influences of m value on the luminescence properties were investigated in detail. As m increased, a redshift phenomenon was observed in both the excitation and emission spectra. First-principle electronic structure calculations showed that the 3d energy level of Ca played an important role in the occurrence of the redshift phenomenon.
- freeze-drying;
- combustion synthesis;
- phosphors powder;
- fluorescence spectra;
- first-principle calculation

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