The calcite and vaterite type LuBO3:Eu3+ nano/microcrystals with various morphologies were synthesized by the hydrothermal (HT) approach through controlling the pH values of the precursor solutions. The calcite type LuBO3:Eu3+ shows the dominant magnetic dipole 5D0-7F1 emission due to S6 inversion symmetry of Lu. It also shows a symmetrical O-Eu charge transfer (CT) excitation band, which, …