Daisy-like Y(OH)3:Eu/Y2O3:Eu microstructure: Formation and luminescence properties

► A simple hydrothermal method to prepare a novel daisy-like Y(OH)3:Eu microstructure. ► This microstructure preserved after heat treatment. ► NaOH and C4H4O6KNa play important roles for the formation of unique microstructure. ► Microscale Y2O3:Eu shows stronger emission intensity than the nanoscale counterpart.