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Fabrication and photoluminescence of Eu-doped KNN-based transparent ceramics

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Abstract

Transparent lead-free luminescent ceramics K0.47Na0.47Li0.06Nb0.94Bi0.06O3–Eu x (KNNLB:Eu) have been fabricated via hot-press sintering technology. The formation of perovskite KNNLB:Eu ceramics with highly densified microstructure was verified through X-ray diffraction and scanning electron microscopy studies. The transmittance spectra, photoluminescence excitation and emission spectra, dependence of the photoluminescence intensity on Eu3+ doping content as well as the luminescence decay curves were investigated. The KNNLB:Eu ceramics present high transmittance both in the near-infrared and the middle-infrared regions, and can be efficiently excited by near-ultraviolet and blue light to realize strong reddish luminescence. The red emission at around 613 nm is particularly intense, which is attributed to the electric dipole transition 5D0–7F2 of Eu3+. The PL properties are also discussed. The emission peak splitting of 5D0–7F2 transition is observed as a response to the change in crystal environment around Eu3+ in the KNNLB:Eu ceramics. With the novel intrinsic ferroelectric properties of KNN, the KNNLB:Eu ceramics could be promising candidates for multifunctional optoelectronic devices.

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Acknowledgements

This work was financed by the School of Materials Science and Engineering of Changzhou University and partly supported by the Department of Applied Physics and Materials Research Centre of The Hong Kong Polytechnic University. We especially thank professor Haitao Huang for technical advice and article-writing assistance.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, Jiangsu, China

    Zhiming Geng & Kun Li

  2. Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, SAR, China

    Xing Li

  3. Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, SAR, China

    Dongliang Shi

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  1. Zhiming Geng
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Correspondence to Kun Li.

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Geng, Z., Li, K., Li, X. et al. Fabrication and photoluminescence of Eu-doped KNN-based transparent ceramics. J Mater Sci 52, 2285–2295 (2017). https://doi.org/10.1007/s10853-016-0521-4

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  • DOI: https://doi.org/10.1007/s10853-016-0521-4

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