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Figure 1

From: Controllable Synthesis of Monodisperse Er3+-Doped Lanthanide Oxyfluorides Nanocrystals with Intense Mid-Infrared Emission

Figure 1

(a–d) SEM images of 0.05 mol Er3+ doped GdOF precursor: pH = 2, 33 mol urea, (a) GdOF-Er-a (1 mmol KF solution), (b) GdOF-Er-b (1 mmol KF solid powder), (c) GdOF-Er-c (1.2 mmol KF solution), (d) GdOF-Er-d (1.2 mmol KF solid powder). (e–h) SEM images of 0.05 mol Er3+ doped GdOF precursor sintered at different temperatures for 3 h: (a) 0 °C, (b) 650 °C, (c) 800 °C, (d) 1000 °C.

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