Abstract
Lanthanum oxide, europium oxide, hydrochloric acid, ammonia water, and carbon powder were used as the starting materials. Detailed characterizations were attained by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry/differential thermal analysis (TG-DTA), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and photoluminescence (PL) spectroscopy. The La(OH)3 precursor was synthesized by an hydrothermal synthesis method at 120 °C for 24 h, which was then converted into La2O2CO3 phase through calcining the precursor at 800 °C for 2 h in a carbon atmosphere. It was demonstrated that the as-obtained La2O2CO3 is a hollow sphere with uniform size about 200 nm. The formation mechanism of the La2O2CO3 phase has also been proposed. Photoluminescence analysis showed that the La2O2CO3:Eu3+ phosphors have the strongest red emissions at 614 nm under 281 nm ultraviolet (UV) light excitation, which correspond to the 5D0 → 7F2 transition of Eu3+ ions. The La2O2CO3:Eu3+ phosphors have double-exponential decay behavior and the calculated lifetime is determined to be t1 = 0.205 μs and t2 = 1.177 μs.
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Funding
This work was supported by National Students’ Plaform for Innovation and Entrepreneurship Training Program (No.201810148015), the Nature Science Foundation of Liaoning Province of China (No. 20170540582), and the National Natural Science Foundation of China (No. 51701090).
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Hou, J., He, Y., Lian, J. et al. Synthesis and optical properties of La2O2CO3:Eu3+ hollow sphere phosphors by hydrothermal synthesis assisting with double-crucible carbonization method. J Aust Ceram Soc 56, 819–828 (2020). https://doi.org/10.1007/s41779-019-00403-w
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DOI: https://doi.org/10.1007/s41779-019-00403-w