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a) Schematic illustration for the synthesis of Eu2O3 NCs. b) TEM and c) HRTEM images of the as‐prepared Eu2O3 NCs. d) XRD pattern of the as‐prepared Eu2O3 NCs. The vertical lines represent the standard pattern of cubic‐phase Eu2O3 (JCPDS No. 34‐0392).
