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2. K. Y. Jung, J. C. Lee, D. S. Kim, B.-K. Choi, and W.-J. Kang, "Co-doping effect of monovalent alkali metals on optical properties of $CeO_2$ :Eu nanophosphor prepared by spray pyrolysis and application for preparing pearlescent pigments with red emission," J. Lumin. 192, 1313-1321 (2017). 

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13. I. Porosnicu, D. Avram, B. Cojocaru, M. Florea, and C. Tiseanu, "Up-conversion luminescence of $Er(Yb)-CeO_2$ : Status and new results," J. Alloys Compd. 711, 627-636 (2017). 

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14. G. Han, M. Wang, D. Li, J. Bai, and G. Diao, "Novel upconversion Er, $Yb-CeO_2$ hollow spheres as scattering layer materials for efficient dye-sensitized solar cells," Sol. Energy Mater. Sol. Cells 160, 54-59 (2017). 

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15. J. Kim, Y. Ryou, G. Hwang, J. Bang, J. Jung, Y. Bang, and D. H. Kim, "Oxychlorination of methane over $FeOx/CeO_2$ catalysts," Korean J. Chem. Eng. 35, 2185-2190 (2018). 

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16. J.-H. Park, H. Noh, T.-S. Chang, and C.-H. Shin, "Low-temperature CO oxidation of $Pt/Al_{0.1}Ce_{0.9}Ox$ catalysts: Effects of supports prepared with different precipitants," Korean J. Chem. Eng. 35, 645-653 (2018). 

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17. M. Yada, T. Miyaguchi, D. Watanabe, Y. Hayashi, T. Ayabe, T. Torikai, and T. Watari, "Morphological control and upconversion luminescence of hollow $CeO_2$ and $Er^{3+}-Yb^{3+}$ codoped $CeO_2$ particles," CrystEngComm 18, 8377-8387 (2016). 

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23. P. Du, E.-J. Kim, and J. S. Yu, "Local symmetry distortion-induced enhancement of upconversion luminescence in $Gd_2O_3:Ho^{3+}/Yb^{3+}/Zn^{2+}$ nanoparticles for solid-state lighting and bioimaging," Curr. Appl. Phys. 18, 310-316 (2018). 

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28. B. H. Min and K. Y. Jung, Synthesis and luminescence characteristics of fine-sized $Ba_3Si_6O_{12}N_2:Eu$ green phosphor through spray pyrolysis using $TEOS/Si_3N_4$ mixed precursors," RSC Adv. 7, 44759-44765 (2017). 

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37. Y. Lei, H. Song, L. Yang, L. Yu, Z. Liu, G. Pan, X. Bai, and L. Fan, "Upconversion luminescence, intensity saturation effect, and thermal effect in $Gd_2O_3:Er^{3+},Yb^{3+}$ nanowires," J. Chem. Phys. 123, 174710 (2005).