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Tessitore, Gabriella; Mudring, Anja-Verena; Krämer, Karl W. (2019). Upconversion luminescence in sub-10 nm β-NaGdF 4 :Yb 3+ ,Er 3+ nanoparticles: an improved synthesis in anhydrous ionic liquids. RSC advances, 9(60), pp. 34784-34792. Royal Society of Chemistry 10.1039/c9ra05950d