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Hehlen, Markus; Frei, Gabriela Claudia; Güdel, Hans-Ulrich (1994). Dynamics of infrared-to-visible upconversion in Cs3Lu2Br9:1%Er3+. Physical review. B - condensed matter and materials physics, 50(22), pp. 16264-16273. American Physical Society 10.1103/PhysRevB.50.16264
