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Preparation, electronic structure and optical properties of CoxLaMg1−xAl11O19 microcrystals

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Abstract

Co-doped LaMgAl11O19 microcrystals were synthesized by a facile sol–gel method. The as-synthesized microcrystals were near hexagonal sheets in shape with the diameter of 100–250 nm and the thickness of 30–50 nm. The electronic structure of the samples was studied using X-ray photoelectron spectroscopy. Co2+ ions are mainly located in tetrahedral sites in the samples, and the binding energy value of Co 2p3/2 decreased with increasing cobalt content. The ionicity of Al–O bond slightly enhanced at first and then kept unchanged with the increase of cobalt content. The absorption and luminescence properties were also studied. All samples exhibited strong absorption band near 600 nm, which was characteristics of tetrahedral Co2+ ions. The weak absorption band at about 350 nm indicated the presence of small amount of octahedral Co2+. The results of XPS and absorption spectra indicated that the fraction of octahedral Co2+ slightly increased with increasing cobalt concentration. The intense emission at 695 nm was observed for Co0.01LaMg0.99Al11O19 sample, Co-doped LaMgAl11O19 microcrystals show promising application as phosphors. This study also provides a facile method to prepare other microcrystals materials.

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Data availability

The data and material were available. All authors contributed to the study. Material preparation, data collection and analysis were performed by LA, ZW, JZ, PZ and XD. The first draft of the manuscript was written by LA and all authors commented on previous versions of the manuscript. HJ revised the English grammar of the manuscript. All authors read and approved the final manuscript.

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Acknowledgements

This work was supported by grant from the National Natural Science Foundation of China (No. 51672160).

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Correspondence to Xiulan Duan.

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Ai, L., Wang, Z., Zhao, J. et al. Preparation, electronic structure and optical properties of CoxLaMg1−xAl11O19 microcrystals. J Mater Sci: Mater Electron 33, 10360–10367 (2022). https://doi.org/10.1007/s10854-022-08023-0

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